Q 1. If a firm's marginal costs then its 2. Suppose two Cournot duopolist firms operate at zero marginal cost. The market demand is p = a - bQ. Firm 1's best-response function is 3. A merger between two firms that produce identical goods would be called 4. In the Cournot model, a firm maximizes profit by selecting 5. In a Bertrand model with identical products