At the most basic level, the field of economics is divided into microeconomics, or the study of individual markets, and macroeconomics, or the study of the economy as a whole. At a more granular level, however, economics has many subfields, depending on how finely you wish to divide the science. A useful classification system is provided by The Journal of Economic Literature.
Subsets of Economics
Here are some of the subfields that the JEL identifies:
- Mathematical and Quantitative Methods
- Econometrics
- Game Theory and Bargaining Theory
- Experimental Economics
- Microeconomics
- Macroeconomics and Monetary Economics
- The Business Cycle
- Money and Interest Rates
- International Economics and International Trade
- Finance and Financial Economics
- Public Economics, Taxation, and Government Spending
- Health, Education, and Welfare
- Labor and Demographic Economics
- Law and Economics
- Industrial Organization
- Business Administration and Business Economics; Marketing; Accounting
- Economic History
- Economic Development, Technological Change, and Growth
- Economic Systems
- Agricultural and Natural Resource Economics
- Urban, Rural, and Regional Economics
In addition, there are a number of fields within economics that didn't significantly exist when the JEL classification was developed, such as behavioral economics, organizational economics, market design, social choice theory, and a number of others.