A general principal-agent problem with two possible outputs, high or low is considered. The agent's utility function is additively separable in wealth and effort. It is shown that under the optimal contract, the agent should pay a penalty fee to the principal if the low output occurs.

We consider a static portfolio system that satisfies adding-up constraints and Tobin's gross substitution theorem. We show the relationship of the two conditions to the weak dominant diagonal property of the matrix of interest rate elasticities. This enables us to investigate effects of...

We consider a market with a profit-maximizing monopolistic firm. Utility-maximizing consumers either buy one unit of the good or none at all. The demand for the good is influenced by local social interactions. That is, the utility which a consumer derives from the consumption of the good depends...

A standard winner-takes-all rent-seeking contest with a principal-agent relationship is extended. One of the two players offers a contract to an agent to act as a delegate on his behalf. The wage offered to the agent is deliberately chosen. The equilibrium of the extended contest is characterized.

<Para ID="Par1">We consider a rent-seeking contest where players compete in groups for a prize of given value. One group has private information about its number of members, which can be either small or large. The other groups have possibly different but publicly known sizes. We present an explicit...</para>

Interdependent preferences generally imply Pareto inefficiency. For a general demand system, we provide a characterization of Pareto improvements. For a prominent parametric specification, the Linear Expenditure System, we characterize in detail the welfare loss associated with interdependent...