# Second-Degree Price Discrimination Benefits

Suppose that individual demand for a product is given by QD = 1000 - 5P. Marginal revenue is MR = 200 - 0.4Q, and marginal cost is constant at $20. There are no fixed costs.

a. The firm is considering a quantity discount. The first 400 units can be purchased at a price of $120, and further units can be purchased at a price of $80. How many units will the consumer buy in total?

b. Show that this second-degree price-discrimination scheme is more profitable than a single monopoly price.

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#### Solution Preview

a)

Qd = 1000 - 5P

Let P = 120

Qd = 1000 - 5(120)

Qd = 1000 - 600

Qd = 400

At a price of $120, the consumer will buy 400 units.

Let P = 80

Qd = 1000 - 5(80)

Qd = 1000 - 400

Qd = 600

At a price ...

#### Solution Summary

Given the function of the demand curve for a product and a monopolist's Marginal Cost, this solution shows how second degree price discrimination in the form of a quantity discount can increase the firm's profits. All calculations are given and explained in full.