It is widely accepted in the literature about the classical Cournot oligopoly model that the loss of quasi-competitiveness islinked, in the long run as new firms enter the market, to instability of the equilibrium. In this paper, though, we present a model in which a stable unique symmetric equilibrium is reached for any number of oligopolists as industry price increases with each new entry. Consequently, the suspicion that nonquasi-competitiveness implies, in the long run, instabilityis proved false.

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