We analyze two-part tariffs in oligopoly, where each firm commits to a certain quantity. The model is an extension of the one introduced in Harrison and Kline (2001).We show that their main results are reversed when the model is extended from one to two types of consumers.

The paper explores second degree price discrimination in a multi- dimensional good context.There are two types of consumers with demand describe by a t wo-dimensional vector,a quantity dimension and a service attribute dimension (mode of usage,usage pattern).

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