$/Q MC $/Q MC P P1=P2 02 P2 D2 Di D1 MR2 MRi MRT Q1=Q2 Quantity Q Q2 Quantity (a (b) Shifts in Demand
Shifts in Demand
In (a),the demand curve D shifts to new demand curve D2. But the new marginal revenue curve MR2 intersects marginal cost at the same point that the old marginal revenue curve MR did. The profit-maximizing output therefore remains the same, although price falls from P to P2. In (b),the new marginal revenue curve MR2 intersects marginal cost at a higher output level Q2.But because demand is now more elastic,price remains the same
In (a), the demand curve D1 shifts to new demand curve D2 . But the new marginal revenue curve MR2 intersects marginal cost at the same point that the old marginal revenue curve MR1 did. The profit-maximizing output therefore remains the same, although price falls from P1 to P2 . In (b), the new marginal revenue curve MR2 intersects marginal cost at a higher output level Q2 . But because demand is now more elastic, price remains the same
$/Q △P ===MC+t t D=AR -MC MR Q1 Qo Quantity Effect of Excise,Tax(标高的价格)on Monopolist
Effect of Excise Tax (标高的价格) on Monopolist
With a tax t per unit,the firm's effective marginal cost is increased by the amount t to MC +t.In this example the increase in price Ap is larger than the tax t
With a tax t per unit, the firm's effective marginal cost is increased by the amount t to MC + t. In this example the increase in price △P is larger than the tax t