Despite the mixed empirical evidence, many economists stillhold to the view that Internet will promote competition betweenfirms,thereby lowering prices and increasing economic welfare. This paperpresents a search model that provides a different view. We analyzethemarket for a homogeneous good...

Consider a Bertrand model in which each firm may be inactive with aknown probability, so the number of active firms is uncertain. Thissimple model has a mixed-strategy equilibrium in which industryprofits are positive and decline with the number of firms, the samefeatures which make the Cournot...

We investigate the nature of market failure in a dynamic version ofAkerlof (1970) where identicalcohorts of a durable good enter the market over time. In the dynamicmodel, equilibria withqualitatively different properties emerge. Typically, in equilibriaof the dynamic model, sellerswith higher...

We investigate the nature of the adverse selection problem in a market for adurable goodwhere trading and entry of new buyers and sellers takes place in continuoustime. In thecontinuous time model equilibria with properties that are qualitativelydifferent from thestatic equilibria, emerge....

In this paper I study conditions for the emergence of cooperativebehavior in a dynamic model of population interaction.The model has finitely many individuals located on a circle. The pay-off of each individual is partly based on the (local)interaction with neighbors and partly on (uniform)...

In this paper we investigate whether markets with heterogeneous network externalities can belocked-in by old technologies even if superior technologies are available. Heterogeneous networkexternalities are present when some consumers care more about the size of the market share of agood than...

Different variations of a Principle of Coordination are used in anumber ofdifferent research traditions. Roughly speaking, one version of thePrinciple says thatif there is a unique Pareto-efficient outcome in a game, then playerswill choose theirpart of that outcome. In this paper I will...

This paper gives an overview of the literature on focal points. It starts with reviewing Schelling’s seminalbook The Strategy of Conflict.I then discuss the problems that have to be faced when incorporating thenotion of focal points in theory of games. Two recent approaches are discussed that...

In this paper, I study the wage a firm sets to attract high abilityworkers (hipo's) in situationsof unemployment. I show that the higher unemployment, the larger afirm's incentives to sorthigh and low ability workers. Moreover, workers will signal their(high) ability in situationsof (high)...

We take a dynamic perspective on insurance markets under adverseselection and study a generalized Rothschildand Stiglitz model where agents may differ with respect to theaccidental probability and their expenditure levels incase an accident occurs. We investigate the nature of dynamicinsurance...