The major divisions of economics include microeconomics, which deals with the behaviour of individual consumers, companies, traders, and farmers; and macroeconomics, which focuses on aggregates such the level of income in an economy, the volume of total employment, and the flow of investment. Another branch, development economics, investigates the history and changes of economic activity and organization over a period of time, as well as their relation to other activities and institutions. Within these three major divisions there are specialized areas of study that attempt to answer questions on a broad spectrum of human economic activity, including public finance, money supply and banking, international trade, labour, industrial organization, and agriculture. The areas of investigation in economics overlap with other social sciences, particularly political science, but economics is primarily concerned with relations between buyer and seller.

Encyclopedia Brittanica