The rent-seeking model of Tullock (1980) has stimulated a large literature on rent-seekingcontests, of which Hillman (1989) and Nitzan (1994) provide useful surveys. AlthoughTullock's 'winner take all' model has been adapted and extended in numerous ways, thereremain fundamental modeling issues,...

In the standard CAPM with a riskless asset we give a simple proof of existence of equilibria without assuming concavity of the investor's utility functions. Moreover, we give a uniqueness result using assumptions on the risk aversion of investors.

In the standard CAPM with a riskless asset we give a sufficient condition for uniqueness. This condition is a joint restriction on the agents´ endowments and their preferences which is compatible with non-increasing absolute risk aversion and which is inparticular satisfied with constant...

This paper analyzes optimal portfolio choice and consumption with stochastic volatility in incomplete markets.

This paper estimates a trivariate two-factor conditional version of the Intertemporal CAPM of Merton (1973).

This paper shows that preferences alone cannot explain the patterns reported in the literature.

In enhanced annuities, the annuity payment depends on one's state ofhealth at some contracted date while in "standard annuities", it does not.The focus of this paper is on an annuity market where "standard" and en-hanced annuities are oered simultaneously. When all insured know equallywell on...