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PAUL KRUGMAN, recipient of the 2008 Nobel Memorial Prize in Economics, is Professor of Economics at Princeton University, USA, where he regularly teaches the principles course. He received his BA from Yale and his PhD from MIT. Prior to his current position, he taught at Yale, Stanford, and MIT. He also spent a year on staff of the Council of Economics Advisors in 1982-1983. His research is mainly in the area of international trade, where he is one of the founders of the 'new trade theory,' which focuses on increasing returns and imperfect competition. He also works in international finance, with a concentration in currency crises. In 1991, Krugman received the American Economic Association's John Bates Clark medal. In addition to his teaching and academic research, Krugman writes extensively for non technical audiences and he is a regular op-ed columnist for the New York Times. ROBIN WELLS was a lecturer and researcher in Economics at Princeton University, USA, where she has taught undergraduate courses. She received her BA from the University of Chicago and her PhD from the University of California, Berkeley; she then did her postdoctoral work at MIT. She has taught at the University of Michigan, the University of Southampton, UK, Stanford, and MIT. Her teaching and research focus on the theory of organizations and incentives. ELIZABETH KELLY teaches at the University of Wisconsin-Madison, USA.

PART I: WHAT IS ECONOMICS? Intro: The Ordinary Business of Life First Principles Economic Models: Trade-offs and Trade Appendix: Graphs in Economics PART II: SUPPLY AND DEMAND Supply and Demand Price Controls and Quotas: Meddling with Markets International Trade Appendix: Consumer and Producer Surplus PART III: INTRODUCTION TO MACROECONOMICS Macroeconomics: The Big Picture Tracking the Macroeconomy Unemployment and Inflation PART IV: LONG-RUN ECONOMIC GROWTH Long-Run Economic Growth Savings, Investment Spending, and the Financial System PART V: SHORT-RUN ECONOMIC FLUCTUATIONS Income and Expenditure Appendix: Deriving the Multiplier Algebraically Aggregate Demand and Aggregate Supply PART VI: STABILIZATION POLICY Fiscal Policy Appendix: Taxes and the Multiplier Money, Banking, and the Federal Reserve System Monetary Policy Appendix: Reconciling Two Models of the Interest Rate Inflation, Disinflation, and Deflation Crises and Consequences PART VII: EVENTS AND IDEAS Events and Ideas PART VIII: THE OPEN ECONOMY Open-Economy Macroeconomics