In this case study of the Swedish beer market we relate the volatility of firms' market shares to changes in their products' market shares. We focus on the four leading firms' product portfolios, and in particular the development of the market shares of old, newly introduced, and withdrawn...

What is the impact of the increasing dominance of conventional firms in e-commerce? We use a simple model to show that retailers who only sell through Internet have lower on-line prices than retailers who also sell through conventional stores. This proposition is firmly supported by our...