Are initial competitive advantages self-reinforcing, so that markets exhibit an endogenous tendency to be dominated by only a few firms? Although this question is of great economic importance, no systematic empirical study has yet addressed it. Therefore, we examine experimentally whether firms...

Exclusive rights, like mineral leases and radio spectrum licences, often hold option-like features. This occurs when licencees do not face the obligation to to develop the lease or to undertake the investment required to use the assigned spectrum. However, to avoid licences being unused for...