In this one-year course, we will study how consumers and firms make decisions and how they interact with each other in the market. We will introduce some important concepts in microeconomics and the basic tools to analyze their behaviors. In the first semester, we will cover the topics including consumer’s behavior, firm theory, market equilibrium under perfect competition and its welfare analysis. In the second semester (Microeconomics II), we will discuss different market structures, including monopoly, oligopoly and monopolistic competition. Then game theory, factor markets and welfare economics follow. By the end of the second semester, we will introduce the concepts of externality and public goods, as well as some topics related to information and uncertainty.