We show that concealing cost information is a dominant strategy in heterogeneous Bertrand oligopolies. This result enables us to endogenize the number of firms in a market in terms of market size, entry costs, and unit cost uncertainty.

[Introduction] Germany currently finds itself in a difficult economic situation, one characterised not only by a long period of weak economic growth, but also by developments that, if the necessary adjustment processes are not accomplished, pose a threat to Germany's medium-term growth...