Paul Krugman is the winner of the 1991 John Bates Clark Medal, given every two years to "that American economist under forty who is adjudged to have made a significant contribution to economic thought and knowledge." I shall attempt to convey a flavor of Krugman's research contributions, grouped...

It seems that firms behave contrary to the standard economic theory of investment. We observe that firms do not invest as soon a price rises above long-run average cost; instead firms wait until price rises substantially above long-run average cost. On the downside, firms stay in business for...

"This paper provides a review of the contradictions and conflicts in the literature on economic governance and sketches an approach to use some of the conceptual and empirical findings from that literature for development policy. The literature offers conflicting conclusions on big questions:...