Pricing Behaviour of the Monopolistic and Duopolistic Firms in the Long Run with Heterogeneous Products

Scholars have compared the pricing behaviour where a monopolist in the short run produces heterogeneous products 1 and 2, and a duopolist i produces goods i (i = 1, 2), where there are exogenous shocks to marginal cost and/or industry demand. This pricing behaviour is short run in that no entry is considered. However, this paper considers whether the existence of a potential entrant producing heterogeneous goods affects the pricing behaviour of the established monopolist under the same random shocks.