We propose a local measure of the relationship between parameter estimates and the
moments of the data they depend on. Our measure can be computed at negligible cost even …

This paper develops a structural model of newspaper markets to analyze the effects of
ownership consolidation, taking into account not only firms' price adjustments but also the …

We study a regulation in Chile that mandates warning labels on products whose sugar or
caloric concentration exceeds certain thresholds. We show that consumers substitute from …

This article analyzes the effect of competition on a supermarket firm's incentive to provide
product quality. In the supermarket industry, product availability is an important measure of …

We study the competitive forces which shaped ideological diversity in the US press in the
early twentieth century. We find that households preferred like-minded news and that …

Competing standards often proliferate in the early years of product markets, potentially
leading to socially inefficient investment. This paper studies the effect of compatibility in the …

This article investigates the welfare implications of the rapid innovation in central processing
units (CPUs), and asks whether it results in inefficient elimination of basic personal computer …

This article predicts how radio station formats would change if, as was recently proposed,
music stations were made to pay fees for musical performance rights. It does so by …

Abstract This paper studies (1) whether, from a welfare point of view, oligopolistic
competition leads to too few or too many products in a market, and (2) how a change in …

This article shows that mergers between close competitors in the music radio industry lead
to important changes in product positioning. Firms that buy competing stations tend to …