We study the problem of defining the product-variety portfolio of a firm in a competitive environment. Large portfolios have become prevalent in many industries supported by competitive pressures and the expectations of increasing revenues due to a wider offer. Such practice, however, is often...

This article lays out several hypotheses to establish a specific link between structural economic reforms and the competitive environment of firms. We test our hypotheses on data from the steel industry in three post-reform economies. We find that economic reforms tend to have a positive effect...