The document defines different economic systems including capitalism, socialism, and communism. Capitalism is a system driven by private ownership and market forces, while socialism involves centralized government control of economic resources. Communism, as introduced by Karl Marx, aims for a classless society with common ownership over the means of production. The key features of different systems are private vs. state ownership, levels of competition, and how economic decisions are made. The document also discusses some potential benefits and criticisms of each system approach.