a) Bertrand Model. The Bertrand model of oligopoly investigates price competition with homogeneous products.
b) In the Bertrand model, assuming that both firms have identical costs, the equilibrium price will be equal to the marginal cost. If both firms set a competitive price with the price equal to marginal cost, neither firm will earn any profits. However, if one firm sets price equal to marginal cost, then if the other firm raises its price above unit cost, then it will earn nothing since all consumers will buy from the firm still setting the competitive price. And the firm will have no incentive to reduce the price as they are already able to sell at a competitive price.
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