international scale and business strategy on the organizational scale. Economists deal with the closed system of a national economy, whereas executives live in the open-system world of business. Moreover, economists know that an economy must be run on the basis of general principles, but businesspeople are forever in search of the particular brilliant strategy. Krugman's article serves to elucidate the world of economics for businesspeople who are so close to it and yet are continually frustrated by what they see. Since 1922, Harvard Business Review has been a leading source of breakthrough management ideas-many of which still speak to and influence us today. The Harvard Business Review Classics series now offers readers the opportunity to make these seminal pieces a part of your permanent management library. Each highly readable volume contains a groundbreaking idea that continues to shape best practices and inspire countless managers around the world-and will have a direct impact on you today and for years to come.

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