Quasimonotone individual demand correspondences are characterized as those which can be rationalized (in a weak sense) by a complete, upper continuous, monotone, and convex preference relation. Moreover, it is shown that an arbitrary set of demand observations can be rationalized by a reflexive,...

We analyze explicit and implicit contracts in a repeated principal-agent model with observable but only partially contractible actions of the agent. It is shown that the set of implementable actions may increase or decrease if additional actions become contractible.

In this paper we introduce markets for information about assets' payoffs in a two-period General Equilibrium Incomplete Markets Model. We consider asymmetric Walrasian equilibria with endogenous information allocations and analyze the interaction between demand for information and equilibrium...

From noisy observations of a finite family of functions an approximation in a lower dimensional space can be constructed using the method of principal components. If certain restrictions are to be satisfied by the approximation, e.g. being densities, this leads to a modified estimation...

Fashion is a popular style of behavior at a given time or place. In this paper we model fashion as a dynamic phenomenon, characterized by fragility of mass behvior and life cycles. Conformity of behavior is generated by a consumption externality, while the typical intertemporal aspects of...

How can diversity be measured? What does it mean to value biodiversity? Can we assist Noah in constructing his preferences? To address these questions following Weitzman (1992,1998), we propose a multi-attribute approach under which the diversity of a set of species is the sum of the values of...