Unit One Text:What Is Economics? Additional Text: The Economic Problem Unit Two Text:Demand and Supply Additional Text:Utility and Consumer Choice Unit Three Text:Price Elasticities of Demand and Supply Additional Text:The Factors Influencing the Price Elasticities of Demand and Supply Unit Four Text: Cost of Production Additional Text: Econonues and Diseconomies of Scale Unit Five Text:Monopoly Additional Text:Perfect Competition Unit Six Text: Oligopoly, Additional Text: Monopolistic Competition Unit Seven Text:Gross Domestic Product . Additional Text:Two Alternative Approaches of Measuring GDP Unit Eight Text:Economic Growth Additional Text: Sources of Economic Development Unit Nine Text: Inflation Additional Text: Unemployment Unit Ten Text:Money and Banking . Additional Text: The U.S. Central Bank: The Federal Reserve System Unit Eleven Text:Foreign Exchange and Exchange Rate. Additional Text: Ihe Effects of Exchange Rates on the Economy. Unit Twelve Text:The Balance of Payments Additional Text: International Monetary Systems Unit Thirteen Text: Fiscal and Monetary Policy. Additional Text: Lags in the Economy's Response to Monetary and Fiscal Policy Unit Foutteen Text: Role of Government in the Economy, Additional Text: Government's Policies Toward Externalities Appendix Ⅰ Answers to Exercises, Appendix Ⅱ Chinese Translation of the Texts