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MR MR Dollars -D2 MR MR, Quantity Refer to the above diagram for a noncollusive oligopolist. We assume that the firm is initially in equilibrium at point Ewhere the equilibrium price and quantity are Pand Q. If the firm's rivals will ignore any price increase but match any price reduction, over what range might marginal cost rise without disturbing equilibrium price and output? b ab Qa Qb