
The above figure shows the reaction functions for two pizza shops in a small isolated town. Firm B producing 100 pizzas and firm A producing 50 pizzas is not a Cournot equilibrium because
◦ firm A is not on its best-response function.
◦ Cournot duopolists agree to share the market equally.
◦ firm B is not on its best-response function.
◦ neither firm is on its best-response function.