We use cumulative reaction functions to compare long-run market structures in aggregative oligopoly games. We first …

may trigger future entry and the collusive agreement is enforced by the most profitable 'grim trigger strategies …' available. It is shown that even in situations where perfect collusion can be sustained after entry, coping with a potential … entrant in a market which is growing over time may completely undermine any pre-entry collusive plans of the incumbent firms …

that entry and exit rates are positively correlated across industries. Our objective is to investigate the effect of sunk … costs and, in particular, market size on entry and exit rates. We analyse a stochastic dynamic model of a monopolistically … show existence and uniqueness of a stationary equilibrium with simultaneous entry and exit: efficient firms survive while …

borderline case. Finally, we apply our setting to trade theory and uncover several new properties hindered by the CES, such as …

, predatory, and entry deterring behaviour. Ascending and uniform-price auctions are particularly vulnerable to these problems (we …

The Paper addresses the issue of coordinated effects of mergers in the framework of a differentiated products model …, mergers are unprofitable unless the length of product lines is very asymmetric. We discuss the implications of the analysis …