This document provides an introduction to health economics. It defines economics as the study of how people make choices with scarce resources to satisfy unlimited wants. Economics can be divided into microeconomics, which examines individual components like industries and households, and macroeconomics, which examines the entire economy as a whole. The document also distinguishes between positive economics, which involves factual statements, and normative economics, which involves value judgments. Finally, it defines health economics as the application of economic theories and tools to topics related to health and health care, including the allocation of scarce resources within the economy and health care system.