The study of the economy as a whole. Macroeconomists seek to explain the economic changes that affect many households, firms and markets simultaneously.
(Peter Dungan, Toronto PPG1002H and Mankiw, N. Gregory, Ronald Kneebone, Kenneth J. McKenzie and Nicholas Rowe. 2008. Principles of Macroeconomics, 4th Canadian ed. Toronto: Thomson Nelson, p. 290.)