Empirical studies have found that enhanced foreign competition can encourage or discourage innovation. To address this relationship, I examine a market structure in which a small number of large multi-product oligopolists compete with a large number of small single-product firms in the same...

This chapter reviews the literature which has developed around the ‘bounds approach’ to market structure over the past fifteen years. The focus of this literature lies in explaining cross-industry differences in concentration, and in the size distribution of firms. One of the main ideas...