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→A two-part tariff when consumer demand is different: deadweight loss |
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However, it is possible for the firm to earn even greater profits. Assume it sets the unit price equal to Pm, and imposes a lump-sum fee equal to area A. Both consumers again remain in the market, except now the firm is making a profit on each unit sold - total market profit from the sale of Qm units at price Pm is equal to area CDE. Profit from the lump-sum fee is 2 x A = AB. Total profit is therefore area ABCDE.
Thus, by charging a higher per unit price and a lower lump-sum fee, the firm has generated area E more profit than if it had charged a lower per-unit price and a higher lump-sum fee. Note that the firm is no longer producing the allocatively efficient output, and there is a [[deadweight loss]] experienced by society equal to area F - this is a result of the exercise of monopoly power.
Consumer X is left with no consumer surplus, while Consumer Y is left with area B.
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