We study a class of boundedly rational choice functions, namely two-stage choosers, which operate as follows. The decision maker uses two criteria in two stages to make a choice. First she shortlists the top-2 alternatives, i.e. two ?nalists, according to one criterion. Next, she chooses the...

We consider an optimal mechanism design problem with several heterogenous objects and interdependent values. We characterize ex post incentives using an appropriate monotonicity condition and reformulate the problem in such a way that the choice of an allocation rule can be separated from the...

Classical definitions of complementarity are based on cross price elasticities, and so they do not apply, for example, when goods are free. This context includes many relevant cases such as online newspapers and public attractions. We look for a complementarity notion that does not rely on price...

We study the effciency and fairness properties of the equal cost sharing mechanism in the provision of a binary and excludable public good. According to the maximal welfare loss criterion, equal cost sharing is optimal within the class of strategyproof, individually rational and no-budgetde…cit...

We provide a framework to evaluate whether or not a seller can increase his revenue in interacting with a privately informed buyer by using money-back guarantees (MBGs). The buyer's value for the good exhibits fi risk and his type is multidimensional giving the probability of Öt as well as the...

Classical deÖnitions of complementarity are based on cross price elasticities, and so they do not apply, for example, when goods are free. This context includes many relevant cases such as online newspapers and public attractions. We look for a complementarity notion that does not rely on price...

We study ex post implementation in an interdependent value framework and with single dimensional types, using a class of mechanisms identified by monotonicity of outcomes and an integral representation of payments. We give examples to illustrate this class and its relation to the previous...

We study efficiency and fairness properties of the equal cost sharing with maximal participation (ECSMP) mechanism in the provision of a binary and excludable public good. According to the maximal welfare loss criterion, the ECSMP is optimal within the class of strategyproof, individually...

We characterize the following choice procedure. The decision maker is endowed with a preference and a similarity - a reflexive binary relation over alternatives. In any choice problem she includes in her choice set all options that are similar to her most preferred feasible alternative. Hence an...