This document discusses the concepts of scarcity, wants, and needs in economics. It begins by outlining three basic economic questions about what to produce, how to produce it, and for whom. It then defines key concepts like scarcity, choice, and opportunity cost. The document notes that resources are limited while wants and needs are unlimited, forcing societies to make choices. It explains that scarcity means not all goods and services can be produced, and that choices must be made between alternatives. The circular flow of the economy and production possibility frontier are also introduced. The document emphasizes that scarcity is a permanent reality and differs from shortages, which are temporary. It concludes by distinguishing between wants and needs from an economist's perspective.