# A Detailed Price Discrimination Example

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1 A Detailed Price Discrimination Example Suppose that there are two different types of customers for a monopolist s product. Customers of type 1 have demand curves as follows. These demand curves include subscripts for prices to allow for the possibility that the monopolist can charge different prices for each type of customer: Q 1 (p 1 ) = 150 p 1 Q 2 (p 2 ) = 200 4p 2 For simplicity, we assume throughout that the monopolist has no fixed costs and we consider separately the monopolist s profit maximizing strategies with two different forms of marginal cost constant marginal cost with MC(Q) = c and increasing marginal cost with MC(Q) = kq 2 Case 1: Third-Degree Price Discrimination If the monopolist can set different prices for each type of consumer, the profit maximizing quantity for each group will be based on its marginal revenue. To compute marginal revenue, first reverse the relationship of price and quantity: p 1 (Q 1 ) = Q 1. p 2 (Q 2 ) = 50 Q 2 / 4. Next multiply price by quantity to find total revenues and differentiate by quantity to find marginal revenue for each type of consumer. TR 1 (Q 1 ) = (150 Q 1 ) Q 1 ; MR 1 (Q 1 ) = 150 2Q 1. TR 2 (Q 2 ) = (50 Q 2 /4) Q 2 ; MR 2 (Q 2 ) = 50 Q 2 /2. Case 1a: Constant MC = c With constant marginal cost, the monopolist can simply solve separate profit maximization problems to determine distinct prices and quantities for each group. The two problems can be solved independently because the price and quantity for one group has no effect on the revenue or costs for production and sales to the other group. Marginal revenue is strictly decreasing in quantity for each group, so the monopolist s profit maximizing quantity for type i occurs when MR i = MC = c. Specifically, the optimal choice of Q 1 is given by MR 1 =150 2Q 1 =c, with solution Q 1 * = 75 c / 2. Similarly the optimal choice of Q 2 is given by MR 2 = 50 Q 2 /2 = c, or Q 2 * = 100 2c. For example, if c = 0, then the profit maximizing solutions and revenue maximizing solutions coincide: Q 1 * = 75, p 1 * = 75, Q 2 * = 100, p 1 * = 25. If c > 50 then the formula for Q 2 * gives a negative quantity. In this case, the marginal cost of each unit is higher than the price any buyer of type 2 is willing to pay, so the optimal choice is Q 2 * = 0. Similarly, if c > 150, then the optimal choice is Q 1 * = 0.

2 Figure 1: Marginal Revenues and Price Discrimination Marginal Revenue A (75, 0) B (100, 0) MR_1 MR_ Quantity Figure 1 compares the marginal revenues for the two types of consumers, where the dotted line represents the marginal revenue for type 2 s. Points A and B represent the optimal choices of quantities (75 for type 1 and 100 for type 2) with constant marginal cost of c = 0. As the constant marginal cost c increases, the profit maximizing quantities to sell to each type of consumer decrease. So for example, if c = 30, then the optimal quantities are Q 1 * = 60, Q 2 * = 40. Consistent with our analysis above, the graph indicates that there should be no sales to type 2 s if c > 50 and no sales to type 1 s if c > 150.

3 Case 1b: Increasing Marginal Cost: C(Q) = kq 2 With increasing marginal cost, the quantity sold to one type of consumer affects the marginal cost of production for the other type of consumer. As a result, the first-order conditions for the two profit maximization problems are interdependent and must be solved simultaneously. With quadratic costs, C(Q) = kq 2, marginal cost MC(Q) = 2kQ is linear in (total) quantity produced, so the two first-order conditions produce a linear system of two equations and two unknowns (Q 1 and Q 2 ). MR 1 (Q 1 ) = MC(Q total ) Q 1. = 2k (Q 1. + Q 2 ) (1) MR 2 (Q 2 ) = MC(Q total ) 50 Q 2 / 2 = 2k (Q 1. + Q 2 ) (2) Solving (1) for Q 1 gives Q 1 = (150 2kQ 2 ) / (2k + 2) (3) Substituting for Q 1 in (2) gives 50 Q 2 / 2 = 2k Q 2 + 2k (150 2kQ 2 ) / (2k + 2) OR (50 Q 2 /2) (2k + 2) = 2k (2k + 2) Q 2 + 2k (150 2kQ 2 ) OR 50 (2k + 2) - Q 2 (k + 1) = (4k 2 + 4k 4k 2 ) Q 2 300k OR k = Q 2 (5k + 1) OR Q 2 * = ( k) / (5k + 1) (4) This equation yields a positive solution for Q 2 * if k < ½. This outcome makes sense because MR 1 (Q 1 = 50) = MR 2 (Q 2 = 0) = 50 = MC(Q total = 50) if k = ½. The monopolist maximizes profits by allocating the first 50 units produced to type 1 (since MR 1 (Q 1 ) > MR 2 (Q 2 = 0) for Q 1 < 50). But if k > 1/2, then the monopolist exhausts all gains from production with MR 1 (Q 1 ) = MC(Q 1 ) for Q 1 < 50 implying Q 2 * = 0. So, if k > 1/2, the monopolist can simply solve an ordinary profit maximization problem for type 1 consumers alone. Then the first-order condition MR 1 (Q 1 ) = MC(Q 1 ) is Q 1. = 2k Q 1 and has solution Q 1 * = 150 / (2 + 2k), p 1 * = 150 (1 + 2k) / (2 + 2k). Further, if k < ½, the monopolist will sell positive quantities to each type of consumer. Substituting (4) into (3) gives Q 1 *(k < ½) = 150 / (2k + 2) 2k( k) / [(2k + 2) (5k + 1)]; = [150 (5k + 1) 2k( k)] / [(2k + 2) (5k + 1)]; = ( k + 400k 2 ) / [(2k + 2) (5k + 1)]; = ( k) / (5k + 1). (5) So for example, if k = 0.05, then Q 1 * = 68 and Q 2 * = 72.

4 Figure 2: Price Discrimination with Quadratic Costs Marginal Revenue D (50, 50) E (140, 14) MR_1 MR_2 MC Total Quantity Figure 2 illustrates the comparison of marginal revenues and marginal costs for optimal price discrimination when the marginal cost varies with the total quantity sold. The monopolist sells the first 50 units to type 1 s, since MR 1 = MR 2 when Q 1 = 50, Q 2 = 0. On the second part of the monopolist s marginal revenue curve, the monopolist sells to both types of consumers and sets MR 1 = MR 2 so that 150 2Q 1 = 50 Q 2 / 2, which simplifies to Q 1 = 50 + Q 2 / 4. This formula indicates that when the monopolist sells to both consumers, it sells four units to type 2 s for each additional unit sold to type 1 s. Total quantity sold is Q t = Q 1 + Q 2 = Q 2 / 4, or Q 2 = 4Q t / Note that this formula gives Q 2 > 0 for Q t > 50, consistent with the conclusion that the monopolist sells the first 50 units to type 1 s. We can identify the marginal revenue corresponding to total quantity Q t by computing MR 2 as a function of Q t. That is, the second part of the monopolist s marginal revenue curve in Figure 2, is given by MR t (Q t ) = MR 2 (Q 2 ) = 50 Q 2 / 2 = 50 (4Q t /5 40) / 2 = 70-2Q t /5. Figure 2 also includes the linear marginal cost curve with C(Q total ) = Q total 2 / 20 so that MC(Q total ) = Q total / 10. Then, MR = MC = 14 at Q total = 140, corresponding to Q 1 * = 68 and Q 2 * = 72 the same values calculated above with C(Q total ) = kq total 2 and k = 0.05.

5 Case 2: Uniform Pricing If it is impossible for the monopolist to distinguish between customers (or illegal to charge different prices for different people buying the same product), then p 1 = p 2 = p. Based on the formulas for Q 1 and Q 2, consumers of type 1 will buy a positive quantity of the good for p < 150, while consumers of type 2 will buy a positive quantity of the good for p < 50. Based on this analysis, total demand Q t is simply the demand from consumers of type 1 for high prices p > 50. By contrast, total demand is the sum of the demands for the two different types of consumers for low prices p < 50. Q t (p) = Q 1 (p) = 150 p if p > 50. Q t (p) = Q 1 (p) + Q 2 (p) = 350 5p if p < 50. Note that it does not matter whether we use one formula or the other at the transition point, p = 50, because each formula gives the same value at this point (since Q 2 (50) = 0). Because of the change of slope (sometimes called a kink ) in the total demand function at p = 50, there are several possible optimal outcomes. There are separate first-order conditions on each portion of the demand function, each of which can identify a local maximum. It is also possible to find an optimum in profits at the transition point, though we will see that this is impossible in the context of this monopoly problem. To proceed with formal analysis, first reverse the relationship between p and Q t on each portion of the demand curve noting that the transition point between the two portions of the demand curve occurs at Q t (50) = 100. p(q t ) = Q t if Q t < 100. p(q t ) = 70 - Q t / 5 if Q t > 100 Multiplying quantity by price, then differentiating with respect to Q t, this means that total revenues and marginal revenues are given by TR(Q t ) = (150 - Q t )Q t if Q t < 100. TR(Q t ) = (70 - Q t / 5) Q t if Q t > 100 MR(Q t ) = 150-2Q t if Q t < 100. MR(Q t ) = 70-2Q t / 5 if Q t > 100 Quantity and total revenue are continuous at the transition point (p = 50, Q t = 100), but marginal revenue is discontinuous at this point for Q t just less than 100, MR = -50, but for Q t just greater than 100, MR = 30. This discontinuity arises because of the entrance of type 2 consumers into the market. Quantity Q t = 100 corresponds to p = 50. If p > 50, (i.e. Q t < 100), type 2 consumers do not purchase the good and so the marginal revenue is computed for type 1 consumers alone. So, if p < 50, (i.e. Q t > 100), marginal revenue MR(Q t ) incorporates the purchases of both types of consumers.

6 Returning to the formulas for the individual marginal revenues, MR 1 is negative and MR 2 is positive at the kink in the demand curve (Q 1 = 100, Q 2 = 0, p = 50). Since this point represents the first time that a type 2 consumer purchases the good, MR 2 is simply equal to the maximum price paid by a type 2 consumer and must be positive. We expect a jump in marginal revenues at the kink in the demand curve since MR 2 is positive at this point (and type 2 consumers are not included in marginal revenue computations until that point). For this reason, it cannot be optimal for the monopolist to produce at the quantity Q k at the kink in demand based on the following two cases: Possibility 1: MR jumps at Q k but is still negative or zero. Then it must increase profits to reduce quantity from Q k. Possibility 2: MR jumps at Q k and is positive. Then it must increase profits to increase quantity from Q k. Because of the jump in the marginal revenue, it will often be the case that MR jumps from negative to positive at Q k (corresponding to a version of possibility 2 above). Then the first-order condition MR = MC could be satisfied on both segments of the demand curve indicating a local maximum in profits at two different quantities. Then it s necessary to compare the profits at these two local optimal points to determine which of them is profit maximizing. Intuitively, the monopolist must absorb losses in sales to consumers of type 1 beyond the optimal level in order to reap the benefits of sales to consumers of type 2. For the specific demand functions in the example, even if c = 0, the monopolist s profit maximizing quantity for type 1 consumers is less than 100 the quantity necessary to bring type 2 consumers into the market. If the gains from selling to type 2 s outweigh the costs of the additional sales to type 1 s, then it would be optimal to sell to both types of consumers and otherwise it is optimal to sell to only type 1 s.. Case 2a: Constant MC = c The first-order conditions with MC = c are given by 150-2Q t = c if Q t < 100 (6) 70-2Q t / 5 = c if Q t > 100 (7) Equation (6) yields the solution Q t1 * = 75 c / 2. Since this formula always satisfies the condition Q t < 100, there is a local maximum where MR = MC on the first segment of the demand curve with Q t < 100. Equation (7) yields the solution Q t2 * = 175 5c / 2. This formula yields a solution with Q t > 100 if c < 30, indicating that there is a second local maximum where MR = MC on the second segment of the demand curve with Q t > 100.

7 Combining these observations, if MC = c > 30, there is a unique local maximum given by Q t * = 75 c / 2 and the monopolist only sells to type 1 consumers. However, if c < 30, there are two local maxima one before and one after the kink in demand at Q k then the monopolist must compare their profits to determine which one is preferable Figure 3: Marginal Revenue with Uniform Pricing Marginal Revenue (100, 30) (100, -50) Quantity Figure 3 graphs the marginal revenues for this uniform pricing case, where the kink in demand at Q = 100 causes a jump in marginal revenue so that (100, -50) and (100, 30) both appear as points on the marginal revenue curve. This graph suggests two immediate observations. First, for 0 < c < 30, we can directly identify the points Q t1 * and Q t2 * by finding the quantities on each of the segments of the marginal revenue lines where MR = c. Second, as c increases, Q t1 * decreases and the losses incurred by producing units from Q t1 * to 100 increase. Similarly as c increases, Q t2 * decreases and the profits for producing units from 100 to Q t2 * to 100 decrease as well. That is, as c increases, the cost to the monopolist of producing a large enough quantity to sell to type 2 consumers increases and the gains from selling to type 2 consumers decreases. Based on these two observations, we expect that the monopolist will prefer Q t1 * to Q t2 * with constant marginal costs close to 30 and that monopolist might prefer Q t2 * to Q t1 * with constant marginal costs close to 0. Formally, since Q t1 * and Q t2 * are separate solutions to the local first order conditions with constant MC and 0 < c < 30, we have to compute the separate profits for these two values and compare them to determine which is the optimal choice for the monopolist.

8 Figure 4: Uniform Pricing Profits (75, 5625) (175, 6125) 5000 Monopoly Profit (70, 4900) (150, 4500) MC = 0 MC = Quantity Figure 4 graphs the monopolist s (uniform pricing) profit as a function of total quantity with MC = 0 and MC = 10. The kink in the demand function causes a dramatic change in the shape of the profit function at Q = 100. In each case, there is a local maximum in profits with Q < 100 and a separate maximum in profits with Q > 100. Consistent with our observations above, the local maxima occur at relatively lower quantities with MC = 10 (when Q t1 * = 70 and Q t2 * = 150) than with MC = 0 (when Q t1 * = 75 and Q t2 * = 175). Also consistent with the observations above, the increase in marginal cost makes Q t1 * more attractive by comparison to Q t2 *. For these particular values of MC = c, the profit maximizing choice is Q t2 * = 175 when c = 0 and Q t1 * = 70 when c = 10. (Some further algebraic computations indicate that Q t1 * is profit maximizing with constant marginal cost c > c* = 50 8*5 ½ 5.27, and Q t2 * is profit maximizing with constant marginal cost c < c*.)

9 Case 2b: Increasing Marginal Cost: C(Q) = kq 2 The first-order conditions with MC = 2kQ are given by 150-2Q t = 2kQ t if Q t < 100 (8) 70-2Q t / 5 = 2kQ t if Q t > 100 (9) Equation (7) yields the solution Q t1 * = 150 / (2 + 2k). Since this formula always satisfies the condition Q t < 100, there is a local maximum where MR = MC on the first segment of the demand curve with Q t < 100. Equation (8) yields the solution Q t2 * = 350 / (2 + 10k). This formula yields a solution with Q t > 100 if k <.15, indicating that there is a second local maximum where MR = MC on the second segment of the demand curve with Q t > 100. Combining these observations, if C(Q) = kq 2 and k >.015, there is a unique local maximum given by Q t * = 150 / (2 + 2k) and the monopolist only sells to type 1 consumers. However, if k <.15, there are two local maxima one before and one after the kink in demand at Q k, and the monopolist must compare the profits at these two points to determine which one is preferable. As in Case 2(a), we expect to find that an increase in marginal cost i.e. an increase in k -- tends to make Q 1t * relatively more attractive by comparison to Q 2t *. Some trial and error calculations support this conclusion if k > k* 0.023, then the monopolist maximizes profits by only selling to type 1 consumers with Q t1 * = 150 / (2 + 2k), but if instead k < k*, the monopolist maximizes profits by selling to both types of consumers with Q t2 * = 350 / (2 + 10k).

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