Economics students explore individual decision-making and national policy commonly used in today's modern mixed-market economies. There is a framework to the study of economics:
Microeconomics - examines how individual firms and consumers, known as economic agents, make decisions. Also considered in microeconomics are the impact decisions made by these individual agents impact markets.
Macroeconomics - explores the economies of entire countries. Macroeconomics thinks about questions of short-term fluctuations in economic activity, like unemployment. It also considers issues like long-term economic growth.
Econometrics - the fundamental tool of analysis used by economists. Data from the 'market' or the 'economy' is examined to see how well it corresponds to economic theory.