Learning-by-doing and increasing returns are often perceived to have similar implications for market structure and conduct. The authors analyze this in the context of an infinite-horizon, price-setting game. Learning is shown to not reduce the viability of market-sharing collusion between a...

When human capital accumulation generates pecuniary externalities across professions, and capital markets are imperfect, persistent inequality in utility and consumption is inevitable in any steady state. This is true irrespective of the degree of divisibility in investments. However,...

When human capital accumulation generates pecuniary externalities across professions, and capital markets are imperfect, persistent inequality "in utility and consumption" is inevitable in "any" steady state. This is true irrespective of the degree of divisibility in investments. However,...

Alternative wage structures under conditions of moral hazard are analyzed from a social-welfare standpoint. It is argued that ex post equity judgements in an uncertainty context should incorporate a preference for "positive correlation" of utilities of different individuals. In the design of...

Consider the problem of Bayesian implementation, i.e., of constructing mechanisms with the property that all Bayesian equilibrium outcomes agree with a given choice rule. The authors show that a general procedure is to start with an incentive-compatible revelation mechanism, and then augment...

We study informal insurance within communities, explicitly recognizing the possibility that subgroups of individuals may destabilize insurance arrangements among the larger group. We therefore consider self--enforcing risk--sharing agreements that are robust not only to single--person deviations...

The authors consider the properties of equilibrium behavior in an aggregative growth model with intergenerational altruism. Various positive properties such as the cyclicity of equilibrium programs and the convergence of equilibrium stocks to a steady state, are analyzed. Among other normative...

We study informal insurance within communities, explicitly recognizing the possibility that subgroups of individuals may destabilize insurance arrangements among the larger group. We therefore consider self-enforcing risk-sharing agreements that are robust not only to single-person deviations...