Theory predicts that optimal effective corporation tax rates will benegatively related to industry specific sunk costs, and hence industryconcentration. Governments should tax industries with monopolistic powersoftly. Evidence suggests that this Schumpeterian (1942) principle ofcorporate...

This paper analyses a dynamic game of investment in R&D or advertising, where current investments change future market conditions. It investigates whether underinvestment can be supported in equilibrium by the threat of escalation in investment outlays. When there are no spillovers, or there is...

This paper traces the time series (?Growth of Firms?) tradition in the study of market structure and looks at how recent studies on entry and the size distribution of firms have modified thinking in this area.