Movements in total quantity and in quality-adjusted price suggest a supply-side shock in the American automobile market in 1955. This paper tests the hypothesis that the shock was a transitory change in industry conduct, a price war. The key ingredients of the test are alternative equilibrium...

This paper develops new empirical models of market concentration from game-theoretic models of entry. The authors construct their models from inequality conditions that describe entrants' equilibrium strategies in simultaneous-move and sequential-move games, and use them to study the effects of...

The authors examine thirty years of computer industry market structure. Their analysis explains the persistence of dominant computer firms, their recent decline, and the changing success of competitive entry. It emphasizes the importance of technological competition between computer 'platforms,'...

A recent empirical literature has shaken economists' confidence in the value of aggregate (industry-level) data to illuminate production relationships. But the statistical finding 'you can't aggregate,' however well documented, is not an economic explanation. Plant-level relationships do...