In this paper we study an oligopolistic equilibria in which (possibly few) corporations can crea te as many firms as they like. It is shown by means of two examples that under constant returns to scale, Subgame Perfect Nash Equilibria implies perfect competitiIn this paper we study an oligopolistic equilibria in which (possibly few) corporations can crea te as many firms as they like. It is shown by means of two examples that under constant returns to scale, Subgame Perfect Nash Equilibria implies perfect competition.[+][-]