Liberalization in telecommunications has led to market competition even at local telephony level. This article deals with a competitor’s decision to enter the market, with the later competition in prices, and with the consumers’ decision to choose their provider. We assume a deregulated...

I this paper we consider a market situation in which initially there is an unintegrated monopoly upstream entry and vertical integration. The equilibrium entry mode -sharing the incumbent facility or building a new facility- is derived as well as the equilibrium market structure. Several policy...