We consider nonparametric identification in models of differentiated products markets, using only market level … models widely used in applied work. We allow for product/market-specific unobservables, endogenous product characteristics (e …) intuition for empirically discriminating between alternative models of oligopoly competition …

market, as measured by international prices, using a representative sample of private French firms. We find that quasi- rents … per worker are only mildly related to the structure of the French product market. The systematic variation in our quasi …-rents is related to international market prices and work force structure, however, producing an estimate of bargaining power …

I develop a new theory of marketing costs and introduce it into a model of trade with product differentiation and firm … productivity heterogeneity. In this model, a firm enters a market if it makes profits by reaching a single consumer there and pays … an increasing marginal cost to access additional consumers. This market penetration cost introduces an extensive margin …

into an initially monopolized market leads to higher prices for some, possibly all, consumers. Entry can induce a … misallocation of goods to consumers, segment the market in a way that transfers surplus to producers and undermine aggressive … strengthening market segmentation. Firms may also forego socially beneficial product improvements in the post-entry equilibrium …

We examine the interplay between market structure and the form that commodity taxation should take in a general … equilibrium model in which firms produce differentiated products and so are able to exert market power. Our analysis takes account … of two important recent developments that affect market structure and so the appropriate design and effectiveness of …

The correlation between productivity and competition is an oft-observed but ill-understood result. Some suggest that … there is a treatment effect of competition on measured productivity, e.g. through a reduction of managerial slack. Others … argue that greater competition makes unproductive establishments exit by reallocating demand to their productive rivals …

with a discussion of empirical predictions together with a brief discussion of supporting evidence available from marketing …

in emerging markets with weak intellectual property rights. Our theoretical framework analyzes the market equilibria … under competition with non-deceptive counterfeiting and deceptive counterfeiting, respectively, as well as under monopoly … consumers have good faith in the market (believe in a low probability that any product is a counterfeit). When the proportion of …

. Inspired by the theory of the core, we explore the idea that the competitive process is the process of sellers and buyers …

In a dynamic environment where underlying competition is "for the market," this paper examines what happens when … entrants and incumbents can instead negotiate for the market. For instance, this might arise when an entrant innovator can …