The authors develop a model of common agency with complete information and general preferences with nontransferable utility, and they prove that the principals' Nash equilibrium in truthful strategies implements an efficient action. The authors apply this theory to the construction of a positive...

We model the electoral politics of redistribution when voters and parties care about inequality in addition to their private concerns for consumption and votes, respectively. Ideological concerns about income redistribution lead each party to adopt a general proportional income tax, adjusted to...

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...

In this paper we ask whether a policy of targeted export promotion can raise domestic welfare when several oligopolistic industries all draw on the same scarce factor of production. Our point of departure is one of Cournot duopoly in which a single home firm competes with a single foreign firm...

This paper analyzes trade in manufactured goods that are produced via a vertical production structure with many stages, where some value is added at each to an intermediate product to yield a good-in-process ready for the next stage. We consider the stage at which a good is traded to be an...

We re-examine the basic investment problem of deciding when to incur a sunk cost to obtain a stochastically fluctuating benefit. The optimal investment rule satisfies a trade-off between a larger versus a later net benefit; we show that this trade-off is closely analogous to the standard...

Capital investment decisions must recognize the limitations on the firm's ability later to sell off or expand capacity. This paper shows how opportunities for future expansion or contraction can be valued as options, how this valuation relates to the q-theory of investment, and how these options...