A macroeconomist examines an economy as a whole with a view to understanding the interaction between economic aggregates such as national income, employment and inflation. Note that general equilibrium theory combines concepts of a macro-economic view of the economy, but does so from a strictly constructed microeconomic viewpoint.
Economics can also be divided into numerous sub-disciplines that do not always fit neatly into the macro-micro categorization. These sub-disciplines include: international economics, labour economics, welfare economics, neuroeconomics, information economics, resource economics, ecological economics, environmental economics, managerial economics, financial economics, urban economics, mathematical economics, development economics, industrial organization, retail economics, war economics, public finance, agricultural economics, transport economics, media economics, monetary economics, economic history, economic psychology, economic sociology, economic anthropology, economic archaeology, and economic geography.