JEL clasification 
  
    
            A00 - General Economics and Teaching 
            A10 - General Economics: General 
            A11 - Role of Economics -  Role of Economists 
            A12 - Relation of Economics to Other Disciplines 
            A13 - Relation of Economics to Social Values 
            A14 - Sociology of Economics 
            A19 - General Economics: Other 
            A20 - Economic Education and Teaching of Economics: General 
            A21 - Economic Education and Teaching of Economics: Pre-college 
            A22 - Economic Education and Teaching of Economics: Undergraduate 
            A23 - Economic Education and Teaching of Economics: Graduate 
            A29 - Economic Education and Teaching of Economics: Other 
            A30 - Collective Works: General 
            A31 - Collected Writings of Individuals 
            A32 - Volumes 
            A33 - Handbooks 
            A39 - Collective Works: Other 
            B00 - History of Economic Thought, Methodology, and Heterodox Approaches 
            B10 - History of Economic Thought through 1925: General 
            B11 - History of Economic Thought: Preclassical (Ancient, Medieval, Mercantilist, Physiocratic) 
            B12 - History of Economic Thought: Classical (includes Adam Smith) 
            B13 - History of Economic Thought: Neoclassical through 1925 (Austrian, Marshallian, Walrasian, Stockholm School) 
            B14 - History of Economic Thought through 1925: Socialist -  Marxist 
            B15 - History of Economic Thought through 1925: Historical -  Institutional -  Evolutionary 
            B16 - History of Economic Thought: Quantitative and Mathematical 
            B19 - History of Economic Thought through 1925: Other 
            B20 - History of Economic Thought since 1925: General 
            B21 - History of Economic Thought: Microeconomics 
            B22 - History of Economic Thought: Macroeconomics 
            B23 - History of Economic Thought: Quantitative and Mathematical 
            B24 - History of Economic Thought since 1925: Socialist -  Marxist -  Sraffian 
            B25 - History of Economic Thought since 1925: Historical -  Institutional -  Evolutionary -  Austrian 
            B26 - History of Economic Thought since 1925: Financial Economics 
            B29 - History of Economic Thought since 1925: Other 
            B30 - History of Economic Thought: Individuals: General 
            B31 - History of Economic Thought: Individuals 
            B32 - Obituaries 
            B40 - Economic Methodology: General 
            B41 - Economic Methodology 
            B49 - Economic Methodology: Other 
            B50 - Current Heterodox Approaches: General 
            B51 - Current Heterodox Approaches: Socialist -  Marxian -  Sraffian 
            B52 - Current Heterodox Approaches: Institutional -  Evolutionary 
            B53 - Current Heterodox Approaches: Austrian 
            B54 - Feminist Economics 
            B59 - Current Heterodox Approaches: Other 
            C00 - Mathematical and Quantitative Methods: General 
            C01 - Econometrics 
            C02 - Mathematical Methods 
            C10 - Econometric and Statistical Methods and Methodology: General 
            C11 - Bayesian Analysis: General 
            C12 - Hypothesis Testing: General 
            C13 - Estimation: General 
            C14 - Semiparametric and Nonparametric Methods: General 
            C15 - Statistical Simulation Methods: General 
            C18 - Methodological Issues: General 
            C19 - Econometric and Statistical Methods: Other 
            C20 - Single Equation Models -  Single Variables: General 
            C21 - Single Equation Models -  Single Variables: Cross-Sectional Models -  Spatial Models -  Treatment Effect Models -  Quantile Regressions 
            C22 - Single Equation Models -  Single Variables: Time-Series Models -  Dynamic Quantile Regressions -  Dynamic Treatment Effect Models 
            C23 - Single Equation Models -  Single Variables: Models with Panel Data -  Longitudinal Data -  Spatial Time Series 
            C24 - Single Equation Models -  Single Variables: Truncated and Censored Models -  Switching Regression Models 
            C25 - Single Equation Models -  Single Variables: Discrete Regression and Qualitative Choice Models -  Discrete Regressors -  Proportions 
            C26 - Single Equation Models: Single Variables: Instrumental Variables (IV) Estimation 
            C29 - Single Equation Models -  Single Variables: Other 
            C30 - Multiple or Simultaneous Equation Models -  Multiple Variables: General 
            C31 - Multiple or Simultaneous Equation Models: Cross-Sectional Models -  Spatial Models -  Treatment Effect Models -  Quantile Regressions -  Social Interaction Models 
            C32 - Multiple or Simultaneous Equation Models: Time-Series Models -  Dynamic Quantile Regressions -  Dynamic Treatment Effect Models 
            C33 - Multiple or Simultaneous Equation Models: Models with Panel Data -  Longitudinal Data -  Spatial Time Series 
            C34 - Multiple or Simultaneous Equation Models: Truncated and Censored Models -  Switching Regression Models 
            C35 - Multiple or Simultaneous Equation Models: Discrete Regression and Qualitative Choice Models -  Discrete Regressors -  Proportions 
            C36 - Multiple or Simultaneous Equation Models: Instrumental Variables (IV) Estimation 
            C38 - Multiple or Simultaneous Equation Models: Classification Methods -  Cluster Analysis -  Factor Models 
            C39 - Multiple or Simultaneous Equation Models -  Multiple Variables: Other 
            C40 - Econometric and Statistical Methods: Special Topics: General 
            C41 - Duration Analysis -  Optimal Timing Strategies 
            C42 - Classification Discontinued 2008. See C83. 
            C43 - Index Numbers and Aggregation -  Leading indicators 
            C44 - Statistical Decision Theory -  Operations Research 
            C45 - Neural Networks and Related Topics 
            C46 - Specific Distributions -  Specific Statistics 
            C49 - Econometric and Statistical Methods: Special Topics: Other 
            C50 - Econometric Modeling: General 
            C51 - Model Construction and Estimation 
            C52 - Model Evaluation, Validation, and Selection 
            C53 - Forecasting Methods -  Simulation Methods  
            C54 - Quantitative Policy Modeling 
            C55 - Large Data Sets: Modeling and Analysis 
            C58 - Financial Econometrics 
            C59 - Econometric Modeling: Other 
            C60 - Mathematical Methods -  Programming Models -  Mathematical and Simulation Modeling: General 
            C61 - Optimization Techniques -  Programming Models -  Dynamic Analysis 
            C62 - Existence and Stability Conditions of Equilibrium 
            C63 - Computational Techniques -  Simulation Modeling 
            C65 - Miscellaneous Mathematical Tools 
            C67 - Input-Output Models 
            C68 - Computable General Equilibrium Models 
            C69 - Mathematical Methods -  Programming Models -  Mathematical and Simulation Modeling: Other 
            C70 - Game Theory and Bargaining Theory: General 
            C71 - Cooperative Games 
            C72 - Noncooperative Games 
            C73 - Stochastic and Dynamic Games -  Evolutionary Games -  Repeated Games 
            C78 - Bargaining Theory -  Matching Theory 
            C79 - Game Theory and Bargaining Theory: Other 
            C8 - Data Collection and Data Estimation Methodology; Computer Programs 
            C80 - Data Collection and Data Estimation Methodology -  Computer Programs: General 
            C81 - Methodology for Collecting, Estimating, and Organizing Microeconomic Data -  Data Access 
            C82 - Methodology for Collecting, Estimating, and Organizing Macroeconomic Data -  Data Access 
            C83 - Survey Methods -  Sampling Methods 
            C87 - Econometric Software 
            C88 - Data Collection and Data Estimation Methodology -  Computer Programs: Other Computer Software 
            C89 - Data Collection and Data Estimation Methodology -  Computer Programs: Other 
            C90 - Design of Experiments: General 
            C91 - Design of Experiments: Laboratory, Individual 
            C92 - Design of Experiments: Laboratory, Group Behavior 
            C93 - Field Experiments 
            C99 - Design of Experiments: Other 
            D00 - Microeconomics: General 
            D01 - Microeconomic Behavior: Underlying Principles 
            D02 - Institutions: Design, Formation, and Operations 
            D03 - Behavioral Economics: Underlying Principles 
            D04 - Microeconomic Policy: Formulation -  Implementation -  Evaluation 
            D10 - Household Behavior: General 
            D11 - Consumer Economics: Theory 
            D12 - Consumer Economics: Empirical Analysis 
            D13 - Household Production and Intrahousehold Allocation 
            D14 - Personal Finance 
            D15 - Intertemporal Household Choice; Life Cycle Models and Saving 
            D16 - Collaborative Consumption 
            D18 - Consumer Protection 
            D19 - Household Behavior and Family Economics: Other 
            D20 - Production and Organizations: General 
            D21 - Firm Behavior: Theory 
            D22 - Firm Behavior: Empirical Analysis 
            D23 - Organizational Behavior -  Transaction Costs -  Property Rights 
            D24 - Production -  Cost -  Capital, Total Factor, and Multifactor Productivity -  Capacity 
            D25 - Intertemporal Firm Choice: Investment, Capacity, and Financing 
            D29 - Production and Organizations: Other 
            D30 - Distribution: General 
            D31 - Personal Income, Wealth, and Their Distributions 
            D33 - Factor Income Distribution 
            D39 - Distribution: Other 
            D40 - Market Structure and Pricing: General 
            D41 - Market Structure and Pricing: Perfect Competition 
            D42 - Market Structure and Pricing: Monopoly 
            D43 - Market Structure and Pricing: Oligopoly and Other Forms of Market Imperfection 
            D44 - Auctions 
            D45 - Rationing -  Licensing 
            D46 - Value Theory 
            D49 - Market Structure and Pricing: Other 
            D50 - General Equilibrium and Disequilibrium: General 
            D51 - Exchange and Production Economies 
            D52 - Incomplete Markets 
            D53 - General Equilibrium and Disequilibrium: Financial Markets 
            D57 - General Equilibrium and Disequilibrium: Input-Output Tables and Analysis 
            D58 - Computable and Other Applied General Equilibrium Models 
            D59 - General Equilibrium and Disequilibrium: Other 
            D60 - Welfare Economics: General 
            D61 - Allocative Efficiency -  Cost-Benefit Analysis 
            D62 - Externalities 
            D63 - Equity, Justice, Inequality, and Other Normative Criteria and Measurement 
            D64 - Altruism 
            D69 - Welfare Economics: Other 
            D70 - Analysis of Collective Decision-Making: General 
            D71 - Social Choice -  Clubs -  Committees -  Associations 
            D72 - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior 
            D73 - Bureaucracy -  Administrative Processes in Public Organizations -  Corruption 
            D74 - Conflict -  Conflict Resolution -  Alliances 
            D78 - Positive Analysis of Policy-Making and Implementation 
            D79 - Analysis of Collective Decision-Making: Other 
            D80 - Information, Knowledge, and Uncertainty: General 
            D81 - Criteria for Decision-Making under Risk and Uncertainty 
            D82 - Asymmetric and Private Information 
            D83 - Search -  Learning -  Information and Knowledge -  Communication -  Belief 
            D84 - Expectations -  Speculations 
            D85 - Network Formation and Analysis: Theory 
            D86 - Economics of Contract: Theory 
            D87 - Neuroeconomics 
            D89 - Information and Uncertainty: Other 
            D90 - Intertemporal Choice and Growth: General 
            D91 - Intertemporal Consumer Choice -  Life Cycle Models and Saving 
            D92 - Intertemporal Firm Choice and Growth, Financing, Investment, and Capacity 
            D99 - Intertemporal Choice and Growth: Other 
            E00 - Macroeconomics and Monetary Economics: General 
            E01 - Measurement and Data on National Income and Product Accounts and Wealth -  Environmental Accounts 
            E02 - Institutions and the Macroeconomy 
            E10 - General Aggregative Models: General 
            E11 - General Aggregative Models: Marxian -  Sraffian -  Institutional -  Evolutionary 
            E12 - General Aggregative Models: Keynes -  Keynesian -  Post-Keynesian 
            E13 - General Aggregative Models: Neoclassical 
            E14 - Austrian; Evolutionary; Institutional 
            E17 - General Aggregative Models: Forecasting and Simulation: Models and Applications 
            E19 - General Aggregative Models: Other 
            E20 - Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) 
            E21 - Macroeconomics: Consumption -  Saving -  Wealth 
            E22 - Capital -  Investment -  Capacity 
            E23 - Macroeconomics: Production 
            E24 - Employment -  Unemployment -  Wages -  Intergenerational Income Distribution -  Aggregate Human Capital 
            E25 - Aggregate Factor Income Distribution 
            E26 - Informal Economy -  Underground Economy 
            E27 - Macroeconomics: Consumption, Saving, Production, Employment, and Investment: Forecasting and Simulation: Models and Applications 
            E29 - Macroeconomics: Consumption, Saving, Production, Employment and Investment: Other 
            E30 - Prices, Business Fluctuations, and Cycles: General (includes Measurement and Data) 
            E31 - Price Level -  Inflation -  Deflation 
            E32 - Business Fluctuations -  Cycles 
            E37 - Prices, Business Fluctuations, and Cycles: Forecasting and Simulation: Models and Applications 
            E39 - Prices, Business Fluctuations, and Cycles: Other 
            E4 - Money and Interest Rates 
            E40 - Money and Interest Rates: General 
            E41 - Demand for Money 
            E42 - Monetary Systems -  Standards -  Regimes -  Government and the Monetary System -  Payment Systems 
            E43 - Interest Rates: Determination, Term Structure, and Effects 
            E44 - Financial Markets and the Macroeconomy 
            E47 - Money and Interest Rates: Forecasting and Simulation: Models and Applications 
            E49 - Money and Interest Rates: Other 
            E5 -	Monetary Policy, Central Banking, and the Supply of Money and Credit 
            E50 - Monetary Policy, Central Banking, and the Supply of Money and Credit: General 
            E51 - Money Supply -  Credit -  Money Multipliers 
            E52 - Monetary Policy 
            E58 - Central Banks and Their Policies 
            E59 - Monetary Policy, Central Banking, and the Supply of Money and Credit: Other 
            E6 - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook 
            E60 - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook: General 
            E61 - Policy Objectives -  Policy Designs and Consistency -  Policy Coordination 
            E62 - Fiscal Policy 
            E63 - Comparative or Joint Analysis of Fiscal and Monetary Policy -  Stabilization -  Treasury Policy 
            E64 - Incomes Policy -  Price Policy 
            E65 - Studies of Particular Policy Episodes 
            E66 - General Outlook and Conditions 
            E69 - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook: Other 
            E71 - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on the Macro Economy 
            F00 - International Economics: General 
            F01 - Global Outlook 
            F02 - International Economic Order 
            F10 - Trade: General 
            F11 - Neoclassical Models of Trade 
            F12 - Models of Trade with Imperfect Competition and Scale Economies 
            F13 - Trade Policy -  International Trade Organizations 
            F14 - Country and Industry Studies of Trade 
            F15 - Economic Integration 
            F16 - Trade and Labor Market Interactions 
            F17 - Trade: Forecasting and Simulation 
            F18 - Trade and Environment 
            F19 - Trade: Other 
            F20 - International Factor Movements and International Business: General 
            F21 - International Investment -  Long-term Capital Movements 
            F22 - International Migration 
            F23 - Multinational Firms -  International Business 
            F24 - Remittances 
            F29 - International Factor Movements: Other 
            F30 - International Finance: General 
            F31 - Foreign Exchange 
            F32 - Current Account Adjustment -  Short-term Capital Movements 
            F33 - International Monetary Arrangements and Institutions 
            F34 - International Lending and Debt Problems 
            F35 - Foreign Aid 
            F36 - Financial Aspects of Economic Integration 
            F37 - International Finance Forecasting and Simulation: Models and Applications 
            F39 - International Finance: Other 
            F40 - Macroeconomic Aspects of International Trade and Finance: General 
            F41 - Open Economy Macroeconomics 
            F42 - International Policy Coordination and Transmission 
            F43 - Economic Growth of Open Economies 
            F44 - International Business Cycles 
            F47 - Macroeconomic Aspects of International Trade and Finance: Forecasting and Simulation: Models and Applications 
            F49 - Macroeconomic Aspects of International Trade and Finance: Other 
            F50 - International Relations and International Political Economy: General 
            F51 - International Conflicts -  Negotiations -  Sanctions 
            F52 - National Security -  Economic Nationalism 
            F53 - International Agreements and Observance -  International Organizations 
            F54 - Colonialism -  Imperialism -  Postcolonialism 
            F55 - International Institutional Arrangements 
            F59 - International Relations and International Political Economy: Other 
            F63 - Economic Impacts of Globalization: Economic Development 
            F64 - Environment 
            F65	- Finance 
            G00 - Financial Economics: General 
            G01 - Financial Crises 
            G02 - Behavioral Finance: Underlying Principles 
            G10 - General Financial Markets: General (includes Measurement and Data) 
            G11 - Portfolio Choice -  Investment Decisions 
            G12 - Asset Pricing -  Trading volume -  Bond Interest Rates 
            G13 - Contingent Pricing -  Futures Pricing -  option pricing 
            G14 - Information and Market Efficiency -  Event Studies 
            G15 - International Financial Markets 
            G17 - Financial Forecasting and Simulation 
            G18 - General Financial Markets: Government Policy and Regulation 
            G19 - General Financial Markets: Other 
            G20 - Financial Institutions and Services: General 
            G21 - Banks -  Other Depository Institutions -  Micro Finance Institutions -  Mortgages 
            G22 - Insurance -  Insurance Companies 
            G23 - Pension Funds -  Other Private Financial Institutions -  Institutional Investors 
            G24 - Investment Banking -  Venture Capital -  Brokerage -  Ratings and Ratings Agencies 
            G28 - Financial Institutions and Services: Government Policy and Regulation 
            G29 - Financial Institutions and Services: Other 
            G30 - Corporate Finance and Governance: General 
            G31 - Capital Budgeting -  Fixed Investment and Inventory Studies -  Capacity 
            G32 - Financing Policy -  Financial Risk and Risk Management -  Capital and Ownership Structure -  Value of Firms 
            G33 - Bankruptcy -  Liquidation 
            G34 - Mergers -  Acquisitions -  Restructuring -  Voting -  Proxy Contests -  Corporate Governance 
            G35 - Payout Policy 
            G38 - Corporate Finance and Governance: Government Policy and Regulation 
            G39 - Corporate Finance and Governance: Other 
            G40 - Behavioral Finance: General 
            G41 - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making in Financial Markets [Neurofinance] 
            G51 - Household Saving, Borrowing, Debt, and Wealth 
            G53 - Financial Literacy 
            H00 - Public Economics: General 
            H10 - Structure and Scope of Government: General 
            H11 - Structure, Scope, and Performance of Government 
            H12 - Crisis Management 
            H19 - Structure and Scope of Government: Other 
            H2 - Taxation, Subsidies, and Revenue 
            H20 - Taxation, Subsidies, and Revenue: General 
            H21 - Taxation and Subsidies: Efficiency -  Optimal Taxation 
            H22 - Taxation and Subsidies: Incidence 
            H23 - Taxation and Subsidies: Externalities -  Redistributive Effects -  Environmental Taxes and Subsidies 
            H24 - Personal Income and Other Nonbusiness Taxes and Subsidies -  includes inheritance and gift taxes 
            H25 - Business Taxes and Subsidies including sales and value-added (VAT) 
            H26 - Tax Evasion 
            H27 - Taxation, Subsidies, and Revenues: Other Sources of Revenue 
            H29 - Taxation and Subsidies: Other 
            H30 - Fiscal Policies and Behavior of Economic Agents: General 
            H31 - Fiscal Policies and Behavior of Economic Agents: Household 
            H32 - Fiscal Policies and Behavior of Economic Agents: Firm 
            H39 - Fiscal Policies and Behavior of Economic Agents: Other 
            H40 - Publicly Provided Goods: General 
            H41 - Public Goods 
            H42 - Publicly Provided Private Goods 
            H43 - Project Evaluation -  Social Discount Rate 
            H44 - Publicly Provided Goods: Mixed Markets 
            H49 - Publicly Provided Goods: Other 
            H50 - National Government Expenditures and Related Policies: General 
            H51 - National Government Expenditures and Health 
            H52 - National Government Expenditures and Education 
            H53 - National Government Expenditures and Welfare Programs 
            H54 - National Government Expenditures and Related Policies: Infrastructures -  Other Public Investment and Capital Stock 
            H55 - Social Security and Public Pensions 
            H56 - National Security and War 
            H57 - National Government Expenditures and Related Policies: Procurement 
            H59 - National Government Expenditures and Related Policies: Other 
            H60 - National Budget, Deficit, and Debt: General 
            H61 - National Budget -  Budget Systems 
            H62 - National Deficit -  Surplus 
            H63 - National Debt -  Debt Management -  Sovereign Debt 
            H68 - Forecasts of Budgets, Deficits, and Debt 
            H69 - National Budget, Deficit, and Debt: Other 
            H70 - State and Local Government -  Intergovernmental Relations: General 
            H71 - State and Local Taxation, Subsidies, and Revenue 
            H72 - State and Local Budget and Expenditures 
            H73 - State and Local Government -  Intergovernmental Relations: Interjurisdictional Differentials and Their Effects 
            H74 - State and Local Borrowing 
            H75 - State and Local Government: Health -  Education -  Welfare -  Public Pensions 
            H76 - State and Local Government: Other Expenditure Categories 
            H77 - Intergovernmental Relations -  Federalism -  Secession 
            H79 - State and Local Government -  Intergovernmental Relations: Other 
            H80 - Public Economics: Miscellaneous Issues: General 
            H81 - Governmental Loans, Loan Guarantees, Credits, and Grants 
            H82 - Governmental Property 
            H83 - Public Administration -  Public Sector Accounting and Audits 
            H84 - Disaster Aid 
            H87 - International Fiscal Issues -  International Public Goods 
            H89 - Public Economics: Miscellaneous Issues: Other 
            I00 - Health, Education, and Welfare: General 
            I10 - Health: General 
            I11 - Analysis of Health Care Markets 
            I12 - Health Production 
            I13 - Health Insurance, Public and Private 
            I14 - Health and Inequality 
            I15 - Health and Economic Development 
            I18 - Health: Government Policy -  Regulation -  Public Health 
            I19 - Health: Other 
            I20 - Education and Research Institutions: General 
            I21 - Analysis of Education 
            I22 - Educational Finance 
            I23 - Higher Education and Research Institutions 
            I24 - Education and Inequality 
            I25 - Education and Economic Development 
            I28 - Education: Government Policy 
            I29 - Education: Other 
            I30 - Welfare and Poverty: General 
            I31 - General Welfare 
            I32 - Measurement and Analysis of Poverty 
            I38 - Welfare and Poverty: Government Programs -  Provision and Effects of Welfare Programs 
            I39 - Welfare and Poverty: Other 
            J00 - Labor and Demographic Economics: General 
            J01 - Labor Economics: General 
            J08 - Labor Economics Policies 
            J10 - Demographic Economics: General 
            J11 - Demographic Trends, Macroeconomic Effects, and Forecasts 
            J12 - Marriage -  Marital Dissolution -  Family Structure -  Domestic Abuse 
            J13 - Fertility -  Family Planning -  Child Care -  Children -  Youth 
            J14 - Economics of the Elderly -  Economics of the Handicapped -  Non-labor Market Discrimination 
            J15 - Economics of Minorities, Races, and Immigrants -  Non-labor Discrimination 
            J16 - Economics of Gender -  Non-labor Discrimination 
            J17 - Value of Life -  Forgone Income 
            J18 - Demographic Economics: Public Policy 
            J19 - Demographic Economics: Other 
            J20 - Demand and Supply of Labor: General 
            J21 - Labor Force and Employment, Size, and Structure 
            J22 - Time Allocation and Labor Supply 
            J23 - Labor Demand 
            J24 - Human Capital -  Skills -  Occupational Choice -  Labor Productivity 
            J26 - Retirement -  Retirement Policies 
            J28 - Safety -  Job Satisfaction -  Related Public Policy 
            J29 - Time Allocation, Work Behavior, and Employment Determination: Other 
            J30 - Wages, Compensation, and Labor Costs: General 
            J31 - Wage Level and Structure -  Wage Differentials 
            J32 - Nonwage Labor Costs and Benefits -  Private Pensions 
            J33 - Compensation Packages -  Payment Methods 
            J38 - Wages, Compensation, and Labor Costs: Public Policy 
            J39 - Wages, Compensation, and Labor Costs: Other 
            J40 - Particular Labor Markets: General 
            J41 - Labor Contracts 
            J42 - Monopsony -  Segmented Labor Markets 
            J43 - Agricultural Labor Markets 
            J44 - Professional Labor Markets -  Occupational Licensing 
            J45 - Public Sector Labor Markets 
            J46 - Informal Labor Markets 
            J47 - Coercive Labor Markets 
            J48 - Particular Labor Markets: Public Policy 
            J49 - Particular Labor Markets: Other 
            J50 - Labor-Management Relations, Trade Unions, and Collective Bargaining: General 
            J51 - Trade Unions: Objectives, Structure, and Effects 
            J52 - Dispute Resolution: Strikes, Arbitration, and Mediation -  Collective Bargaining 
            J53 - Labor-Management Relations -  Industrial Jurisprudence 
            J54 - Producer Cooperatives -  Labor Managed Firms -  Employee Ownership 
            J58 - Labor-Management Relations, Trade Unions, and Collective Bargaining: Public Policy 
            J59 - Labor-Management Relations, Trade Unions, and Collective Bargaining: Other 
            J60 - Mobility, Unemployment, and Vacancies: General 
            J61 - Geographic Labor Mobility -  Immigrant Workers 
            J62 - Job, Occupational, and Intergenerational Mobility -  Promotion 
            J63 - Labor Turnover -  Vacancies -  Layoffs 
            J64 - Unemployment: Models, Duration, Incidence, and Job Search 
            J65 - Unemployment Insurance -  Severance Pay -  Plant Closings 
            J68 - Mobility, Unemployment, and Vacancies: Public Policy 
            J69 - Mobility, Unemployment, and Vacancies: Other 
            J70 - Labor Discrimination: General 
            J71 - Labor Discrimination 
            J78 - Labor Discrimination: Public Policy 
            J79 - Labor Discrimination: Other 
            J80 - Labor Standards: General 
            J81 - Labor Standards: Working Conditions 
            J82 - Labor Standards: Labor Force Composition 
            J83 - Labor Standards: Workers' Rights 
            J88 - Labor Standards: Public Policy 
            J89 - Labor Standards: Other 
            K00 - Law and Economics: General 
            K10 - Basic Areas of Law: General (Constitutional Law) 
            K11 - Property Law 
            K12 - Contract Law 
            K13 - Tort Law and Product Liability 
            K14 - Criminal Law 
            K19 - Basic Areas of Law: Other 
            K20 - Regulation and Business Law: General 
            K21 - Antitrust Law 
            K22 - Corporation and Securities Law 
            K23 - Regulated Industries and Administrative Law 
            K24 - Cyber Law 
            K29 - Regulation and Business Law: Other 
            K30 - Other Substantive Areas of Law: General 
            K31 - Labor Law 
            K32 - Environmental, Health, and Safety Law 
            K33 - International Law 
            K34 - Tax Law 
            K35 - Personal Bankruptcy Law 
            K36 - Family and Personal Law 
            K39 - Other Substantive Areas of Law: Other 
            K40 - Legal Procedure, the Legal System, and Illegal Behavior: General 
            K41 - Litigation Process 
            K42 - Illegal Behavior and the Enforcement of Law 
            K49 - Legal Procedure, the Legal System, and Illegal Behavior: Other 
            L00 - Industrial Organization: General 
            L10 - Market Structure, Firm Strategy, and Market Performance: General 
            L11 - Production, Pricing, and Market Structure -  Size Distribution of Firms 
            L12 - Monopoly -  Monopolization Strategies 
            L13 - Oligopoly and Other Imperfect Markets 
            L14 - Transactional Relationships -  Contracts and Reputation -  Networks 
            L15 - Information and Product Quality -  Standardization and Compatibility 
            L16 - Industrial Organization and Macroeconomics: Industrial Structure and Structural Change -  Industrial Price Indices 
            L17 - Open Source Products and Markets 
            L19 - Market Structure, Firm Strategy, and Market Performance: Other 
            L20 - Firm Objectives, Organization, and Behavior: General 
            L21 - Business Objectives of the Firm 
            L22 - Firm Organization and Market Structure 
            L23 - Organization of Production 
            L24 - Contracting Out -  Joint Ventures -  Technology Licensing 
            L25 - Firm Performance: Size, Diversification, and Scope 
            L26 - Entrepreneurship 
            L29 - Firm Objectives, Organization, and Behavior: Other 
            L30 - Nonprofit Organizations and Public Enterprise: General 
            L31 - Nonprofit Institutions -  NGOs 
            L32 - Public Enterprises -  Public-Private Enterprises 
            L33 - Comparison of Public and Private Enterprises and Nonprofit Institutions -  Privatization -  Contracting Out 
            L38 - Public Policy 
            L39 - Nonprofit Organizations and Public Enterprise: Other 
            L40 - Antitrust Issues and Policies: General 
            L41 - Monopolization -  Horizontal Anticompetitive Practices 
            L42 - Vertical Restraints -  Resale Price Maintenance -  Quantity Discounts 
            L43 - Legal Monopolies and Regulation or Deregulation 
            L44 - Antitrust Policy and Public Enterprises, Nonprofit Institutions, and Professional Organizations 
            L49 - Antitrust Policy: Other 
            L50 - Regulation and Industrial Policy: General 
            L51 - Economics of Regulation 
            L52 - Industrial Policy -  Sectoral Planning Methods 
            L53 - Enterprise Policy 
            L59 - Regulation and Industrial Policy: Other 
            L60 - Industry Studies: Manufacturing: General 
            L61 - Metals and Metal Products -  Cement -  Glass -  Ceramics 
            L62 - Automobiles -  Other Transportation Equipment 
            L63 - Microelectronics -  Computers -  Communications Equipment 
            L64 - Other Machinery -  Business Equipment -  Armaments 
            L65 - Chemicals -  Rubber -  Drugs -  Biotechnology 
            L66 - Food -  Beverages -  Cosmetics -  Tobacco -  Wine and Spirits 
            L67 - Other Consumer Nondurables 
            L68 - Appliances -  Other Consumer Durables 
            L69 - Industry Studies: Manufacturing: Other 
            L70 - Industry Studies: Primary Products and Construction: General 
            L71 - Mining, Extraction, and Refining: Hydrocarbon Fuels 
            L72 - Mining, Extraction, and Refining: Other Nonrenewable Resources 
            L73 - Forest Products 
            L74 - Construction 
            L78 - Industry Studies: Primary Products and Construction: Government Policy 
            L79 - Industry Studies: Primary Products and Construction: Other 
            L80 - Industry Studies: Services: General 
            L81 - Retail and Wholesale Trade -  e-Commerce 
            L82 - Entertainment -  Media 
            L83 - Sports -  Gambling -  Recreation -  Tourism 
            L84 - Personal, Professional, and Business Services 
            L85 - Real Estate Services 
            L86 - Information and Internet Services -  Computer Software 
            L87 - Postal and Delivery Services 
            L88 - Industry Studies: Services: Government Policy 
            L89 - Industry Studies: Services: Other 
            L90 - Industry Studies: Transportation and Utilities: General 
            L91 - Transportation: General 
            L92 - Railroads and Other Surface Transportation 
            L93 - Air Transportation 
            L94 - Electric Utilities 
            L95 - Gas Utilities -  Pipelines -  Water Utilities 
            L96 - Telecommunications 
            L97 - Utilities: General 
            L98 - Industry Studies: Utilities and Transportation: Government Policy 
            L99 - Industry Studies: Utilities and Transportation: Other 
            M00 - Business Administration and Business Economics -  Marketing -  Accounting: General 
            M1 - Business Administration 
            M1 - Business Administration 
            M10 - Business Administration: General 
            M11 - Production Management 
            M12 - Personnel Management -  Executive Compensation 
            M13 - New Firms -  Startups 
            M14 - Corporate Culture -  Social Responsibility 
            M15 - IT Management 
            M16 - International Business Administration 
            M19 - Business Administration: Other 
            M2 - Business Economics 
            M20 - Business Economics: General 
            M21 - Business Economics 
            M29 - Business Economics: Other 
            M30 - Marketing and Advertising: General 
            M31 - Marketing 
            M37 - Advertising 
            M38 - Marketing and Advertising: Government Policy and Regulation 
            M39 - Marketing and Advertising: Other 
            M4 - Accounting and Auditing 
            M40 - Accounting and Auditing: General 
            M41 - Accounting 
            M42 - Auditing 
            M48 - Accounting and Auditing: Government Policy and Regulation 
            M49 - Accounting: Other 
            M50 - Personnel Economics: General 
            M51 - Personnel Economics: Firm Employment Decisions -  Promotions 
            M52 - Personnel Economics: Compensation and Compensation Methods and Their Effects 
            M53 - Personnel Economics: Training 
            M54 - Personnel Economics: Labor Management 
            M55 - Personnel Economics: Labor Contracting Devices 
            M59 - Personnel Economics: Other 
            N00 - Economic History: General 
            N01 - Development of the Discipline: Historiographical -  Sources and Methods 
            N1 - Macroeconomics and Monetary Economics; Industrial Structure; Growth; Fluctuations 
            N10 - Economic History: Macroeconomics and Monetary Economics -  Growth and Fluctuations: General, International, or Comparative 
            N11 - Economic History: Macroeconomics -  Growth and Fluctuations: U.S. -  Canada: Pre-1913 
            N12 - Economic History: Macroeconomics -  Growth and Fluctuations: U.S. -  Canada: 1913- 
            N13 - Economic History: Macroeconomics -  Growth and Fluctuations: Europe: Pre-1913 
            N14 - Economic History: Macroeconomics -  Growth and Fluctuations: Europe: 1913- 
            N15 - Economic History: Macroeconomics -  Growth and Fluctuations: Asia including Middle East 
            N16 - Economic History: Macroeconomics -  Growth and Fluctuations: Latin America -  Caribbean 
            N17 - Economic History: Macroeconomics -  Growth and Fluctuations: Africa -  Oceania 
            N20 - Economic History: Financial Markets and Institutions: General, International, or Comparative 
            N21 - Economic History: Financial Markets and Institutions: U.S. -  Canada: Pre-1913 
            N22 - Economic History: Financial Markets and Institutions: U.S. -  Canada: 1913- 
            N23 - Economic History: Financial Markets and Institutions: Europe: Pre-1913 
            N24 - Economic History: Financial Markets and Institutions: Europe: 1913- 
            N25 - Economic History: Financial Markets and Institutions: Asia including Middle East 
            N26 - Economic History: Financial Markets and Institutions: Latin America -  Caribbean 
            N27 - Economic History: Financial Markets and Institutions: Africa -  Oceania 
            N30 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: General, International, or Comparative 
            N31 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: U.S. -  Canada: Pre-1913 
            N32 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: U.S. -  Canada: 1913- 
            N33 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: Europe: Pre-1913 
            N34 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: Europe: 1913- 
            N35 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: Asia including Middle East 
            N36 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: Latin America -  Caribbean 
            N37 - Economic History: Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy: Africa -  Oceania 
            N40 - Economic History: Government, War, Law, International Relations, and Regulation: General, International, or Comparative 
            N41 - Economic History: Government, War, Law, International Relations, and Regulation: U.S. -  Canada: Pre-1913 
            N42 - Economic History: Government, War, Law, International Relations, and Regulation: U.S. -  Canada: 1913- 
            N43 - Economic History: Government, War, Law, International Relations, and Regulation: Europe: Pre-1913 
            N44 - Economic History: Government, War, Law, International Relations, and Regulation: Europe: 1913- 
            N45 - Economic History: Government, War, Law, International Relations, and Regulation: Asia including Middle East 
            N46 - Economic History: Government, War, Law, International Relations, and Regulation: Latin America -  Caribbean 
            N47 - Economic History: Government, War, Law, International Relations, and Regulation: Africa -  Oceania 
            N50 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: General, International, or Comparative 
            N51 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: U.S. -  Canada: Pre-1913 
            N52 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: U.S. -  Canada: 1913- 
            N53 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: Europe: Pre-1913 
            N54 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: Europe: 1913- 
            N55 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: Asia including Middle East 
            N56 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: Latin America -  Caribbean 
            N57 - Economic History: Agriculture, Natural Resources, Environment, and Extractive Industries: Africa -  Oceania 
            N60 - Economic History: Manufacturing and Construction: General, International, or Comparative 
            N61 - Economic History: Manufacturing and Construction: U.S. -  Canada: Pre-1913 
            N62 - Economic History: Manufacturing and Construction: U.S. -  Canada: 1913- 
            N63 - Economic History: Manufacturing and Construction: Europe: Pre-1913 
            N64 - Economic History: Manufacturing and Construction: Europe: 1913- 
            N65 - Economic History: Manufacturing and Construction: Asia including Middle East 
            N66 - Economic History: Manufacturing and Construction: Latin America -  Caribbean 
            N67 - Economic History: Manufacturing and Construction: Africa -  Oceania 
            N70 - Economic History: Transport, International and Domestic Trade, Energy, Technology, and Other Services: General, International, or Comparative 
            N71 - Economic History: Transport, Trade, Energy, Technology, and Other Services: U.S. -  Canada: Pre-1913 
            N72 - Economic History: Transport, Trade, Energy, Technology, and Other Services: U.S. -  Canada: 1913- 
            N73 - Economic History: Transport, Trade, Energy, Technology, and Other Services: Europe: Pre-1913 
            N74 - Economic History: Transport, Trade, Energy, Technology, and Other Services: Europe: 1913- 
            N75 - Economic History: Transport, Trade, Energy, Technology, and Other Services: Asia including Middle East 
            N76 - Economic History: Transport, Trade, Energy, Technology, and Other Services: Latin America -  Caribbean 
            N77 - Economic History: Transport, Trade, Energy, Technology, and Other Services: Africa -  Oceania 
            N80 - Micro-Business History: General, International, or Comparative 
            N81 - Micro-Business History: U.S. -  Canada: Pre-1913 
            N82 - Micro-Business History: U.S. -  Canada: 1913- 
            N83 - Micro-Business History: Europe: Pre-1913 
            N84 - Micro-Business History: Europe: 1913- 
            N85 - Micro-Business History: Asia including Middle East 
            N86 - Micro-Business History: Latin America -  Caribbean 
            N87 - Micro-Business History: Africa -  Oceania 
            N90 - Regional and Urban History: General 
            N91 - Regional and Urban History: U.S. -  Canada: Pre-1913 
            N92 - Regional and Urban History: U.S. -  Canada: 1913- 
            N93 - Regional and Urban History: Europe: Pre-1913 
            N94 - Regional and Urban History: Europe: 1913- 
            N95 - Regional and Urban History: Asia including Middle East 
            N96 - Regional and Urban History: Latin America -  Caribbean 
            N97 - Regional and Urban History: Africa -  Oceania 
            O00 - Economic Development, Technological Change, and Growth 
            O1 - Economic Development 
            O10 - Economic Development: General 
            O11 - Macroeconomic Analyses of Economic Development 
            O12 - Microeconomic Analyses of Economic Development 
            O13 - Economic Development: Agriculture -  Natural Resources -  Energy -  Environment -  Other Primary Products 
            O14 - Industrialization -  Manufacturing and Service Industries -  Choice of Technology 
            O15 - Economic Development: Human Resources -  Human Development -  Income Distribution -  Migration 
            O16 - Economic Development: Financial Markets -  Saving and Capital Investment -  Corporate Finance and Governance 
            O17 - Formal and Informal Sectors -  Shadow Economy -  Institutional Arrangements 
            O18 - Economic Development: Urban, Rural, Regional, and Transportation Analysis -  Housing -  Infrastructure 
            O19 - International Linkages to Development -  Role of International Organizations 
            O20 - Development Planning and Policy: General 
            O21 - Planning Models -  Planning Policy 
            O22 - Project Analysis 
            O23 - Fiscal and Monetary Policy in Development 
            O24 - Development Planning and Policy: Trade Policy -  Factor Movement -  Foreign Exchange Policy 
            O25 - Industrial Policy 
            O29 - Development Planning and Policy: Other 
            O30 - Technological Change -  Research and Development -  Intellectual Property Rights: General 
            O31 - Innovation and Invention: Processes and Incentives 
            O32 - Management of Technological Innovation and R&D 
            O33 - Technological Change: Choices and Consequences -  Diffusion Processes 
            O34 - Intellectual Property Rights 
            O35 - Social Innovation 
            O36 - Open Innovation 
            O38 - Technological Change: Government Policy 
            O39 - Technological Change: Other 
            O40 - Economic Growth and Aggregate Productivity: General 
            O41 - One, Two, and Multisector Growth Models 
            O42 - Monetary Growth Models 
            O43 - Institutions and Growth 
            O44 - Environment and Growth 
            O47 - Measurement of Economic Growth -  Aggregate Productivity -  Cross-Country Output Convergence 
            O49 - Economic Growth and Aggregate Productivity: Other 
            O50 - Economywide Country Studies: General 
            O51 - Economywide Country Studies: U.S. -  Canada 
            O52 - Economywide Country Studies: Europe 
            O53 - Economywide Country Studies: Asia including Middle East 
            O54 - Economywide Country Studies: Latin America -  Caribbean 
            O55 - Economywide Country Studies: Africa 
            O56 - Economywide Country Studies: Oceania 
            O57 - Comparative Studies of Countries 
            P00 - Economic Systems: General 
            P10 - Capitalist Systems: General 
            P11 - Capitalist Systems: Planning, Coordination, and Reform 
            P12 - Capitalist Enterprises 
            P13 - Cooperative Enterprises 
            P14 - Capitalist Systems: Property Rights 
            P16 - Capitalist Systems: Political Economy 
            P17 - Capitalist Systems: Performance and Prospects 
            P19 - Capitalist Systems: Other 
            P20 - Socialist Systems and Transitional Economies: General 
            P21 - Socialist Systems and Transitional Economies: Planning, Coordination, and Reform 
            P22 - Socialist Systems and Transitional Economies: Prices 
            P23 - Socialist Systems and Transitional Economies: Factor and Product Markets -  Industry Studies -  Population 
            P24 - Socialist Systems and Transitional Economies: National Income, Product, and Expenditure -  Money -  Inflation 
            P25 - Socialist Systems and Transitional Economies: Urban, Rural, and Regional Economics 
            P26 - Socialist Systems and Transitional Economies: Political Economy -  Property Rights 
            P27 - Socialist Systems and Transitional Economies: Performance and Prospects 
            P28 - Socialist Systems and Transitional Economies: Natural Resources -  Energy -  Environment 
            P29 - Socialist Systems and Transitional Economies: Other 
            P30 - Socialist Institutions and Their Transitions: General 
            P31 - Socialist Enterprises and Their Transitions 
            P32 - Collectives -  Communes -  Agriculture 
            P33 - Socialist Institutions and Their Transitions: International Trade, Finance, Investment, and Aid 
            P34 - Socialist Institutions and Their Transitions: Financial Economics 
            P35 - Socialist Institutions and Their Transitions: Public Economics 
            P36 - Socialist Institutions and Their Transitions: Consumer Economics -  Health -  Education and Training: Welfare, Income, Wealth, and Poverty 
            P37 - Socialist Systems and Transitional Economies: Legal Institutions -  Illegal Behavior 
            P39 - Socialist Institutions and Their Transitions: Other 
            P40 - Other Economic Systems: General 
            P41 - Other Economic Systems: Planning, Coordination, and Reform 
            P42 - Other Economic Systems: Productive Enterprises -  Factor and Product Markets -  Prices -  Population 
            P43 - Other Economic Systems: Public Economics -  Financial Economics 
            P44 - Other Economic Systems: National Income, Product, and Expenditure -  Money -  Inflation 
            P45 - Other Economic Systems: International Trade, Finance, Investment and Aid 
            P46 - Other Economic Systems: Consumer Economics -  Health -  Education and Training -  Welfare, Income, Wealth, and Poverty 
            P47 - Other Economic Systems: Performance and Prospects 
            P48 - Other Economic Systems: Political Economy -  Legal Institutions -  Property Rights -  Natural Resources -  Energy -  Environment -  Regional Studies 
            P49 - Other Economic Systems: Other 
            P50 - Comparative Economic Systems: General 
            P51 - Comparative Analysis of Economic Systems 
            P52 - Comparative Studies of Particular Economies 
            P59 - Comparative Economic Systems: Other 
            Q00 - Agricultural and Natural Resource Economics -  Environmental and Ecological Economics: General 
            Q01 - Sustainable Development 
            Q02 - Global Commodity Crises 
            Q10 - Agriculture: General 
            Q11 - Agriculture: Aggregate Supply and Demand Analysis -  Prices 
            Q12 - Micro Analysis of Farm Firms, Farm Households, and Farm Input Markets 
            Q13 - Agricultural Markets and Marketing -  Cooperatives -  Agribusiness 
            Q14 - Agricultural Finance 
            Q15 - Land Ownership and Tenure -  Land Reform -  Land Use -  Irrigation -  Agriculture and Environment 
            Q16 - Agricultural R&D -  Agricultural Technology -  Biofuels -  Agricultural Extension Services 
            Q17 - Agriculture in International Trade 
            Q18 - Agricultural Policy -  Food Policy 
            Q19 - Agriculture: Other 
            Q20 - Renewable Resources and Conservation: General 
            Q21 - Renewable Resources and Conservation: Demand and Supply (the Commons) 
            Q22 - Renewable Resources and Conservation: Fishery -  Aquaculture 
            Q23 - Renewable Resources and Conservation: Forestry 
            Q24 - Renewable Resources and Conservation: Land 
            Q25 - Renewable Resources and Conservation: Water 
            Q26 - Recreational Aspects of Natural Resources 
            Q27 - Renewable Resources and Conservation: Issues in International Trade 
            Q28 - Renewable Resources and Conservation: Government Policy 
            Q29 - Renewable Resources and Conservation: Other 
            Q30 - Nonrenewable Resources and Conservation: General 
            Q31 - Nonrenewable Resources and Conservation: Demand and Supply 
            Q32 - Exhaustible Resources and Economic Development 
            Q33 - Resource Booms 
            Q34 - Natural Resources and Domestic and International Conflicts 
            Q35 - Hydrocarbon Resources 
            Q37 - Nonrenewable Resources and Conservation: Issues in International Trade 
            Q38 - Nonrenewable Resources and Conservation: Government Policy 
            Q39 - Nonrenewable Resources and Conservation: Other 
            Q40 - Energy: General 
            Q41 - Energy: Demand and Supply 
            Q42 - Alternative Energy Sources 
            Q43 - Energy and the Macroeconomy 
            Q47 - Energy Forecasting 
            Q48 - Energy: Government Policy 
            Q49 - Energy: Other 
            Q50 - Environmental Economics: General 
            Q51 - Valuation of Environmental Effects 
            Q52 - Pollution Control Adoption Costs -  Distributional Effects -  Employment Effects 
            Q53 - Air Pollution -  Water Pollution -  Noise -  Hazardous Waste -  Solid Waste -  Recycling 
            Q54 - Climate -  Natural Disasters -  Global Warming 
            Q55 - Environmental Economics: Technological Innovation 
            Q56 - Environment and Development -  Environment and Trade -  Sustainability -  Environmental Accounts and Accounting -  Environmental Equity -  Population Growth 
            Q57 - Ecological Economics: Ecosystem Services -  Biodiversity Conservation -  Industrial Ecology 
            Q58 - Environmental Economics: Government Policy 
            Q59 - Environmental Economics: Other 
            R00 - Urban, Rural, Regional, and Transportation Economics: General 
            R10 - General Regional Economics (includes Regional Data) 
            R11 - Regional Economic Activity: Growth, Development, Environmental Issues, and Changes 
            R12 - Size and Spatial Distributions of Regional Economic Activity 
            R13 - General Equilibrium and Welfare Economic Analysis of Regional Economies 
            R14 - Land Use Patterns 
            R15 - General Regional Economics: Econometric and Input-Output Models -  Other Models 
            R19 - General Regional Economics: Other 
            R20 - Urban, Rural, Regional, and Transportation Economics: Household Analysis: General 
            R21 - Urban, Rural, Regional, and Transportation Economics: Housing Demand 
            R22 - Urban, Rural, Regional, and Transportation Economics: Other Demand 
            R23 - Urban, Rural, Regional, and Transportation Economics: Regional Migration -  Regional Labor Markets -  Population -  Neighborhood Characteristics 
            R28 - Urban, Rural, Regional, and Transportation Economics: Government Policy 
            R29 - Urban, Rural, Regional, and Transportation Economics: Household Analysis: Other 
            R30 - Housing Markets, Production Analysis, and Firm Location: General 
            R31 - Housing Supply and Markets 
            R32 - Other Production and Pricing Analysis 
            R33 - Nonagricultural and Nonresidential Real Estate Markets 
            R34 - Production Analysis and Firm Location: Input Demand Analysis 
            R38 - Production Analysis and Firm Location: Government Policy -  Regulatory Policies 
            R39 - Housing Markets, Production Analysis, and Firm Location: Other 
            R40 - Transportation Systems: General 
            R41 - Transportation: Demand, Supply, and Congestion -  Safety and Accidents -  Transportation Noise 
            R42 - Transportation Systems: Government and Private Investment Analysis -  Road Maintenance, Transportation Planning 
            R48 - Transportation Systems: Government Pricing and Policy 
            R49 - Transportation Systems: Other 
            R50 - Regional Government Analysis: General 
            R51 - Finance in Urban and Rural Economies 
            R52 - Regional Government Analysis: Land Use and Other Regulations 
            R53 - Public Facility Location Analysis -  Public Investment and Capital Stock 
            R58 - Regional Development Planning and Policy 
            R59 - Regional Government Analysis: Other 
            Y10 - Data: Tables and Charts 
            Y20 - Introductory Material 
            Y30 - Book Reviews (unclassified) 
            Y40 - Dissertations (unclassified) 
            Y50 - Further Reading (unclassified) 
            Y60 - Excerpt 
            Y70 - No Author General Discussions 
            Y80 - Related Disciplines 
            Y90 - Miscellaneous Categories: Other 
            Y91 - Pictures and Maps 
            Z00 - Other Special Topics: General 
            Z10 - Cultural Economics -  Economic Sociology -  Economic Anthropology: General 
            Z11 - Cultural Economics: Economics of the Arts and Literature 
            Z12 - Cultural Economics: Religion 
            Z13 - Economic Sociology -  Economic Anthropology -  Social and Economic Stratification 
            Z18 - Cultural Economics: Public Policy 
            Z19 - Cultural Economics: Other 
            Z30 - Tourism Economics: General 
            Z31 - Industry Studies 
            Z32 - Tourism and Development 
            Z33 - Marketing and Finance 
            Z39 - Tourism: Other