This paper examines a general problem exemplified by post-auction (third generation---`3G') mobile telecommunications markets. When entering these (or any other) markets, firms must often decide on the degree of coverage (`roll-out') they wish to achieve. Prior investment must be sunk in order...

We consider a model in which Cournot-Nash oligopolistic service providers are able to trade radio spectrum licences, subject to interference constraints. The terms of trade are endogenised through Nash bargaining. When the providers are in the same (geographical) market, the incentive to trade...