The document defines economic systems and describes four main types: traditional, command, market, and mixed. It provides details on the key features and examples of each system. A traditional economy is based on customs and meets needs through activities like farming, hunting, and gathering. A command economy involves centralized government control over production and distribution. A theoretical market economy has no government intervention. Most modern economies are mixed, combining market forces and some government role in areas like setting standards. The document concludes with an exercise matching terms to economic systems and assigning homework on analyzing a specific system.