We propose a framework for analyzing transformations of demand. Such transformations frequently stem from changes in the dispersion of consumers` valuations, which lead to rotations of the demand curve. In a wide variety of settings, profits are a U-shaped function of dispersion. A high level of...

We present a general Cournot model in which each firm may sell multiple quality-differentiated products. We use an upgrades approach, working not with the actual products, but instead with upgrades from one quality to the next. The properties of single-product Cournot models carry over to the...

Firms selling multiple quality-differentiated products frequently alter their product lines when a competitor enters the market. We present a model of multiproduct monopoly and duopoly using a general `upgrades` approach that yields a powerful analytical framework. We provide a simple...

A number of recent papers have analyzed leasing in the new-car market as a response to the adverse-selection problem in the used-car market originally explored in the seminal 1970 paper by George Akerlof. In this paper we consider a model characterized by both adverse selection, as in these...

There has been substantial growth in rates of new-car leasing over the last few decades. Building on recent theoretical research, we construct a model of the leasing decision in which leasing mitigates adverse selection and reduces transaction costs, but moral hazard limits its use. In our...

Firms selling multiple quality-differentiated products frequently alter their product lines when a competitor enters the market. We present a model of multiproduct monopoly and duopoly using a general "upgrades" approach that yields a powerful analytical framework. We provide an explanation for...