This document provides an overview of the four major schools of economic thought: Marxist, Keynesian, Monetarist, and Austrian. It briefly describes the key aspects of each school. The Marxist school is based on the writings of Marx and Engels and sees societies progressing through stages from primitive communism to capitalism to socialism to communism, with each stage defined by class struggles. The Keynesian school, developed by John Maynard Keynes, focuses on macroeconomic variables and the government's role in managing total demand. The Monetarist and Austrian schools emphasize the importance of money and individual decision making, respectively.