The relevance of imperfect competition for models of economic fluctuations has received increased attention from researchers in both macroeconomics and industrial organization. The authors outline a new methodology for estimating industry markups of price over marginal cost and the influence of...

This paper is a panel data study on the behavior of prices and margins of oligopolies involved in repeated games. The authors examine two supergame models which generate very different predictions about the cyclical behavior of prices and margins. Evidence on the levels of price-cost margins...

The authors reply to the comment by D. R. Kamerschen and J. Park on their 1988 paper published in this Review. They find that the econometric point raised by these authors is flawed, because differences in model structure and data are ignored. In particular, the importance of materials input in...