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### Third Degree Price Discrimination offered two sizes of packages, 1 unit for $12 & 2 units for $20.

Some pricing strategies that we will explore:

- Price discrimination – 1st, 2nd, & 3rd degree
- “Two-part Tariff” pricing
- Bundling
- Advertising
- Cost-plus markup pricing
- Product Lines
- Peak-Load pricing
- Transfer Pricing

- Charging different prices to different consumers for the same product.
- Enables firms to charge some consumers higher prices, and to capture consumer surplus.

Under what conditions is price discrimination possible?

- Firm must have some control over price.
- The firm can identify different submarkets.
- The submarkets have different price elasticities of demand.
- The firm can prevent arbitrage (the purchase of an item for immediate resale in order to profit from the price discrepancy).

3 Types of Price Discrimination

- First Degree
- Each customer is charged the maximum price that they are willing to pay.
- Second Degree – involves self-selectionOne type of 2nd degree price discrimination is block pricing or quantity discounts in which firms charge different prices depending on volume of usage.
- Third Degree or multi-market (most common)
- Markets distinguished by other factors.

Since under first degree price discrimination, each customer is charged the maximum price that they are willing to pay, consumer surplus is zero.

Note: Each time the firm sells another unit, it increases its revenues by the price for which it sells that unit.

Unlike the usual situation, it doesn’t need to lower to price to all the other customers in order to sell to the additional one.

So P=MR & the Demand & MR curves are the same, with 1st degree price discrimination.

First Degree Price Discrimination$

D

= MR

Q

First degree price discrimination its revenues by the price for which it sells that unit. Example:

- Suppose the demand curve for a monopolist’s product is: P = 9 – 0.005 Q.
- The average total cost curve is a horizontal line: ATC = MC = 1.5
- Determine the price, quantity, consumer surplus, producer surplus (profit), & the sum of consumer & producer surplus, if the firm does NOT price discriminate.
- Determine the quantity, consumer surplus, producer surplus (profit), & the sum of consumer & producer surplus, if the firm does price discriminate.

First, if the firm does NOT price discriminate: its revenues by the price for which it sells that unit.

- We have the demand curve for a monopolist’s product is: P = 9 – 0.005 Q.
- & the average total cost curve is: ATC = MC = 1.5
- TR = PQ =(9 – 0.005 Q) Q = 9 Q – 0.005 Q2 .
- Then MR = dTR/dQ = 9 – 0.01 Q .
- Setting MR = MC, we have 9 – 0.01Q = 1.5
- or 7.5 = 0.01 Q .
- So Q = 750,
- & P = 9 – 0.005 Q = 9 – 0.005 (750) = 5.25.
- Profit or producer surplus = TR – TC = PQ – (ATC)Q = (5.25)(750) – (1.5)(750) = 2812.5

Consumer Surplus its revenues by the price for which it sells that unit. = (1/2)(750)(3.75) = 1406.25

$

9

P*= 5.25

profit

ATC =MC =1.5

D

MR

Q

Q*= 750

Without Price DiscriminationCombined consumer & producer surplus is CS + PS = 1406.25 + 2812.5 = 4218.75

Now if the firm does its revenues by the price for which it sells that unit. 1st degree price discrimination:

- We had the demand curve: P = 9 – 0.005 Q,
- & the average total cost curve: ATC = MC = 1.5
- MR is now the same as the demand function,
- so MR = 9 – 0.005 Q.
- Setting MR = MC,
- we have 9 – 0.005Q = 1.5
- or 7.5 = 0.005 Q .
- So Q = 1500.

$ its revenues by the price for which it sells that unit.

Profit = (1/2) (1500) (7.5) = 5625

9

ATC =MC =1.5

D=MR

Q

Q*= 1500

With 1st Degree Price DiscriminationCombined consumer & producer surplus is CS + PS = 0 + 5625 = 5625

2 its revenues by the price for which it sells that unit. nd Degree Price Discrimination: Block Pricing

- Price is based on volume of usage of the good.
- Those who consume large quantities are charged a lower price.
- Those consuming small quantities are charged a higher price.

Second Degree Price Discrimination Example its revenues by the price for which it sells that unit.

- Suppose there are 100 high-volume consumers who value the 1st unit of a good at $15 & a 2nd unit at $10.
- There are also 100 low-volume consumers who value the 1st unit at $12.
- The total cost of production is TC = 6 Q. (So ATC = TC/Q = 6Q/Q = 6.)
- Determine the total revenue, total cost, producer surplus (profit), consumer surplus, & sum of the producer & consumer surplus for the following four options:
- No price discrimination – one unit sells for $15.
- No price discrimination –one unit sells for $12.
- No price discrimination –one unit sells for $10.
- Offer two sizes of packages, 1 unit for $12 & 2 units for $20.

High-volume consumers value the 1st unit of a good at $15 & the 2nd unit at $10.

Low-volume consumers value the 1st unit at $12.

$

$

15

12

10

6

6

ATC

ATC

1

2

Q

1

Q

Suppose firm sells all units individually for $15. the 2nd unit at $10.

The 100 high-volume consumers will buy 1unit.The 100 low-volume consumers will buy 0 units.

$

$

15

12

profit

10

6

6

ATC

ATC

1

Q

1

2

Q

TR = PQ = 15(100) = 1500,

TC = 6 Q = 6 (100) = 600, &

Producer Surplus or = TR – TC = 1500 – 600 = 900.

Consumer surplus = 0(100) = 0.

PS + CS = 900 + 0 = 900

Suppose firm sells all units individually for $12. the 2nd unit at $10.

The 100 high-volume consumers will buy 1unit.The 100 low-volume consumers will buy 1 unit.

$

$

15

CS

12

12

10

profit

profit

6

6

ATC

ATC

1

Q

1

2

Q

TR = 12(200) = 2400,

TC = 6 Q = 6(200) = 1200, &

Producer Surplus or = TR – TC= 2400 – 1200 = 1200.

Consumer Surplus = 3(100) + 0(100) = 300

PS + CS = 1200 + 300 = 1500

Suppose firm sells all units individually for $10. the 2nd unit at $10.

The 100 high-volume consumers will buy 2 units.The 100 low-volume consumers will buy 1 units.

$

$

15

12

CS

CS

10

10

profit

profit

profit

6

6

ATC

ATC

1

Q

1

2

Q

TR = PQ = 10(300) = 3000,

TC = 6 Q = 6 (300) = 1800, &

Producer Surplus or = TR – TC = 3000 – 1800 = 1200.

Consumer surplus = 5(100) + 2(100) = 700.

PS + CS = 1200 + 700 = 1900

Suppose firm sells 1-unit packs for $12 & 2-unit packs for $20.

The high-volume consumers will buy a 2-unit pack.The low-volume consumers will buy a 1-unit pack.

$

$

15

12

CS

10

profit

profit

6

ATC

6

ATC

1

Q

1

2

Q

TR = PQ = 12(100) + 20(100)= 3200,

TC = 6 Q = 6 (300) = 1800, &

Producer Surplus or = TR – TC = 3200 – 1800 = 1400.

Consumer surplus = 5(100) + 0(100) = 500.

PS + CS = 1400 + 500 = 1900

In our 2nd degree price discrimination case, the firm offered two sizes of packages, 1 unit for $12 & 2 units for $20.

The 100 high-volume consumers value the 1st unit of a good at $15 & the 2nd unit at $10.

However, notice that if the firm tried to charge $25 for the 2-pack, the high-volume consumers would only buy a 1-pack. This is because they would be better off with consumer surplus of $15 – $12 = 3 with a 1-pack than consumer surplus of $25 – $25 = 0 with a 2-pack.

The profit with 2nd order price discrimination is more than the profit for the one-price options. PS+CS is the same as for the unit price of $10, but the producer has captured the $200 low-volume CS as PS or profit.

Third Degree Price Discrimination offered two sizes of packages, 1 unit for $12 & 2 units for $20.

- Charging different prices to different groups.
- Example: Charging lower movie admissions to students & senior citizens than to other movie-goers.

For each group, the firm produces such that MR = MC .

The group with the lowest elasticity pays the highest price.

Example: Students & senior citizens may have more limited incomes, and therefore be more responsive to changes in movie prices. Other movie-goers may be less responsive to changes in movie prices.

Suppose the demand functions for two groups of consumers are D1: P = 101 – 13Q and D2: P = 53 – 7 Q. Notice that D1 is steeper and so less elastic than D2 .(So group 1 will pay a higher price than group 2.) The total cost function is TC = 90 + 128Q – 22Q2 + Q3 . If the firm is able to price discriminate between the two groups, determine the prices that should be charged, the quantities that will be purchased, total revenue, total cost, and profit.

- We need to equate the two MR functions to the MC function.
- MC = dTC/dQ = 128 – 44Q + 3Q2.
- Group 1: TR1 = PQ = (101 – 13Q)Q = 101Q – 13Q2 , and
- MR1 = dTR1/dQ = 101 – 26 Q
- Group 2: TR2 = PQ = (53 – 7Q)Q = 53Q – 7Q2 , and
- MR2 = dTR2/dQ = 53 – 14 Q

Our Group 1 Demand function was P = 101 – 13 Q, and Dthe MR function was MR1 = 101 – 26 Q. The MC function was MC = 128 – 44Q + 3Q2.

- Set MR1 = MC: 101 – 26 Q = 128 – 44Q + 3Q2
- 0 = 3Q2 – 18Q + 27
- Dividing by 3 to simplify: 0 = Q2 – 6Q + 9
- 0 = (Q – 3) (Q – 3)
- Q – 3 = 0
- So for Group 1, Q = 3
- From Group 1’s demand function, P1 = 101 – 13 (3) = 62.
- The revenue from Group 1 will be PQ = (62)(3) = 186.

Our Group 2 Demand function was P = 53 – 7 Q, and Dthe MR function was MR2 = 53 – 14 Q. The MC function was MC = 128 – 44Q + 3Q2.

- Set MR2 = MC:53 – 14 Q = 128 – 44Q + 3Q2
- 0 = 3Q2 – 30Q + 75
- Dividing by 3 to simplify: 0 = Q2 – 10Q + 25
- 0 = (Q – 5) (Q – 5)
- Q – 5 = 0
- So for Group 2, Q = 5
- From Group 2’s demand function, P2 = 53 – 7 (5) = 18.
- The revenue from Group 2 will be PQ = (18)(5) = 90

Adding the revenues from the two groups together, we get TR = 186 + 90 = 276.

- Since we produced 3 units for Group 1 and 5 for Group 2, our production level is 8.
- Plugging 8 into our total cost function, TC = 90 + 128Q – 22Q2 + Q3 = 218.
- So our profit is = TR – TC = 276 – 218 = 58.

The “Two-Part Tariff” = 186 + 90 = 276.

- There are two components to the price: a unit price (P) for each unit consumed, & a “tariff” (T) for entry into the market.
- Examples include BJ’s, telephone service, health clubs, etc.
- The tariff enables the firm to capture some consumer surplus.

P* = 186 + 90 = 276.

Q*

Suppose that a firm has constant average and marginal costs as shown.Also, each customer has the indicated demand curve.

Suppose that the firm charges price P* per unit.

Based on the per unit charge, the firm earns revenues equal to the area of the blue box.

P

ATC=MC

D

Q

The firm can also pick up the consumer surplus, = 186 + 90 = 276.

if it charges a membership fee equal to the area of the green triangle.

P

P*

ATC=MC

D

Q

Q*

The firm’s total revenue (from each customer) is the combined areas of the blue box and the green triangle.

Recall that ATC = TC/Q.

So, TC = ATC•Q.

So, the total cost (from each customer) is the purple box.

P

P*

ATC=MC

The firm’s profit (per customer) is TR - TC which is the orange figure.

D

Q

Q*

The firm’s profit from this two-part tariff strategy will be greatest if it produces where the Demand and ATC = MC curves intersect, or P = ATC = MC.

P

P*

ATC=MC

D

Q

Q*

Two-Part Tariff Example be greatest if it produces where the Demand and ATC = MC curves intersect, or P = ATC = MC.

- Suppose a firm’s TC function is TC = 5Q.
- Suppose also that each of the firm’s customers has this demand curve: P = 35 – Q .
- Determine the appropriate unit price and membership fee for a two-part tariff pricing strategy.
- Also determine the quantity purchased, total revenue, total cost, and profit per customer.

Demand function (for each person): P = 35 – Q be greatest if it produces where the Demand and ATC = MC curves intersect, or P = ATC = MC.Total cost function: TC = 5Q

- As we indicated previously, the firm’s profit will be greatest if it produces where P = ATC = MC.
- ATC = MC = 5
- So, P = 35 – Q = 5 ,
- So, 30 = Q.
- So revenue per person from per unit sales is PQ = (5)(30) = 150 .
- Next we need to determine the appropriate membership fee.

The membership fee is the consumer surplus. be greatest if it produces where the Demand and ATC = MC curves intersect, or P = ATC = MC.

That is the area of the orange triangle, which is (1/2)(30)(30) = 450.

So the membership fee should be $450.

P

35

5

ATC=MC

D

Q

30

Combining the membership fee of $450 with the per unit sales revenues of $150 that we found earlier, we have total revenues per customer of $450 + $150 = $600.

- From the total cost function, the total production cost for the 30 units per customer is TC = 5Q = 5(30) = 150.
- So our profit per customer is = TR – TC = 600 – 150 = $450.

Bundling revenues of $150 that we found earlier, we have total revenues per customer of

- Bundling is packaging two or more products to gain a pricing advantage.
- Conditions necessary for bundling to be the appropriate pricing alternative:
- Customers are heterogeneous.
- Price discrimination is not possible.
- Demands for the two products are negatively correlated.

Consider the following reservations prices, revenues of $150 that we found earlier, we have total revenues per customer of for two buyers: Alan and Beth

To get both people to buy both goods without bundling, you can only charge $225 + $275 = $500, & each person would have consumer surplus of $600 – $500 = $100.

If you bundle, you can charge $600 & consumer surplus = 0.

The effectiveness of bundling as a pricing strategy depends upon the degree of negative correlation between the demands for the two goods.

Advertising: upon the degree of negative correlation between the demands for the two goods.How does a firm determine the profit-maximizing advertising level?

- The ratio of the firm’s advertising to its sales revenue should equal the negative of the ratio of the advertising & price elasticities of demand.
- That is,A/(P*Q) = - A / D
- So you should advertise a lot if the elasticity of demand
- with respect to advertising is high, &
- with respect to price is low.

Example: Suppose that elasticity of demand with respect to advertising is 0.10, and elasticity of demand with respect to price is -0.50. What percent of sales revenues should the advertising budget should be?

- A/(P*Q) = - A / D = -0.10 / -0.50 = 0.20 or 20%

Cost-Plus Pricing advertising is 0.10, and elasticity of demand with respect to price is -0.50. What percent of sales revenues should the advertising budget should be?

- The price charged by the firm is the average total cost of production plus a percentage of that cost.
- Example: If the average total cost of production is $50, and the firm uses a 10% markup, the firm will sell the product for $55.

Pricing using Product Lines advertising is 0.10, and elasticity of demand with respect to price is -0.50. What percent of sales revenues should the advertising budget should be?

- A firm may have several lines of a product, such as
- (1) a regular line,
- (2) an economy product (for people who want to save money), &
- (3) a top-of-the-line product (for people who want “the best”).
- To maximize profit, the firm sets MR = MC for each product line.

Product-Line Pricing Example: A company has 3 product lines. deluxe: TC= 70 + 40Q + Q2 & demand function isP = 90 – 4Q regular: TC = 65 + 30Q + Q2 & demand function is P = 84 – 2Q economy: TC = 50 + 20Q + Q2 & demand function is P = 60 – Q Determine the profit-maximizing price for each line.

- For each product line, we want MR = MC. So for each line, we need to calculate MC = dTC/dQ, TR = PQ, & MR = dTR/dQ.
- deluxe: MC = 40 + 2 Q
- TR = (90 – 4Q)Q = 90 Q – 4Q2
- MR = 90 – 8Q
- regular: MC = 30 + 2 Q
- TR = (84 – 2Q)Q = 84 Q – 2Q2
- MR = 84 – 4Q
- economy: MC = 20 + 2 Q
- TR = (60 – Q)Q = 60 Q – Q2
- MR = 60 – 2Q

For our product-line pricing example, we have so far: deluxe: P = 90 – 4Q, MR = 90 – 8 Q MC = 40 + 2 Q, regular: P = 84 – 2Q, MR = 84 – 4Q MC = 30 + 2 Q, economy: P = 60 – Q, MR = 60 – 2Q MC = 20 + 2 Q,

- For each line we set MR = MC. So,
- For the deluxe line,
- 90 – 8 Q = 40 + 2 Q
- 50 = 10 Q & Q = 5.
- From the demand function, the deluxe price is P = 90 – 4 Q = 90 – 4(5) = 90 – 20 = 70.
- For the regular line,
- 84 – 4 Q = 30 + 2 Q
- 54 = 6Q & Q = 9.
- The regular price is P = 84 – 2(9) = 84 – 18 = 66.
- For the economy line,
- 60 – 2 Q = 20 + 2 Q
- 40 = 4 Q & Q = 10.
- The economy price is P = 60 – 10 = 60 – 10 = 50.

Peak-Load Pricing deluxe: P = 90 – 4Q, MR = 90 – 8 Q MC = 40 + 2 Q,

- When demand is not evenly distributed, a firm needs to have facilities to accommodate periods of high demand.
- Even with large facilities, the firm may experience times when the demand is greater than can be handled. Then the firm may experience costly computer system crashes.
- During off-peak times (periods of lower demand), there is excess capacity.
- The firm charges less at off-peak times.
- Example: More phone calls are made during business hours than in the evenings and on weekends. So the phone companies charge more during business hours.

Peak-Load Pricing Example: deluxe: P = 90 – 4Q, MR = 90 – 8 Q MC = 40 + 2 Q, Suppose the demand function for a firm’s service is Peak times (days): P = 74 – 5 Q Off-peak times (nights): P = 26 – 5 Q The marginal cost of providing the service is MC = 2 + 2Q .Determine the day & night profit-maximizing prices.

- We need to find when MR = MC for days & for nights.
- For days,TR = PQ = (74 – 5 Q) Q = 74 Q – 5 Q2
- So MR = dTR/dQ = 74 – 10 Q .
- MR = MC implies 74 – 10 Q= 2 + 2 Q,
- or 72 = 12 Q.
- So Q = 6
- & peak price is P = 74 – 5 Q = 74 – 5(6) = $44 per unit.

Next we need to do the same thing for nights to find the off-peak price. We had these demand functions: Peak times (days): P = 74 – 5 Q Off-peak times (nights): P = 26 – 5 Q and the marginal cost function was MC = 2 + 2Q .

- For nights, TR = PQ = (26 – 5 Q) Q = 26 Q – 5 Q2
- So MR = dTR/dQ = 26 – 10 Q .
- MR = MC implies 26 – 10 Q= 2 + 2 Q,
- or24 = 12 Q.
- So Q = 2
- & off-peak price is P = 26 – 5 Q = 26 – 5(2) = $16 per unit (instead of $44 per unit as it was for peak times).

Transfer Pricing off-peak price.

- Sometimes firms are organized into separate divisions.
- One division may produce an intermediate product and supply it to another division to produce the final product.
- How does the firm determine the efficient price at which the intermediate product should be sold. That is, what is the transfer price?

The Simplest Case off-peak price.

- The firm has 2 divisions: E and A
- Division E produces the intermediate product (engine) for Division A which produces the final product (automobile).
- Division E does not sell engines to anyone but division A, and division A does not buy engines from anyone but division E.
- Each unit of output (automobile) requires one unit of the input (engine).
- The goal is to maximize the firm’s profit.

First, find the company’s (total) marginal cost MC off-peak price. T, which is the marginal cost of division E’s producing an engine (MCE) plus the marginal cost of division A’s producing an auto (MCA).

That is, MCT = MCA + MCE .

Then, produce the amount of output (autos) so that the marginal revenue from selling an auto (MR) is equal to the marginal cost of production (MCT).

The appropriate price of the auto for that quantity of output is determined from the demand curve for the firm’s autos.

How do we determine the optimal quantity & price for the final product (the auto)?If the company determines the price of the engine, then division E is a price taker. So, PE and MRE will be equal.

The firm should set the price of the intermediate product (the engine) so that PE = MRE = MCE at the profit-maximizing output level previously determined.

So what is the transfer price at which division E sells the intermediate product to division A?Transfer Pricing Example division E is a price taker. So, P

- A company has 2 divisions: production & marketing.
- The production division’s total cost function is TCp = 70,000 + 15Q + 0.005 Q2.
- The marketing division’s total cost function is TCm = 30,000 + 10 Q .
- The demand function for the final marketed product is Pf = 100 – 0.001 Q .
- What should be the price that transfers the product from production to marketing?
- Also determine the price of the final product and the firm’s profit.
- The marginal cost functions for the 2 divisions are
- Production: MCp = dTCp/dQ = 15 + 0.01 Q
- Marketing: MCm = dTCm/dQ = 10
- So thecombined MC = MCp + MCm = 25 + 0.01 Q
- TR = PfQ = (100 – 0.001 Q) Q = 100 Q – 0.001 Q2
- So MR = dTR/dQ = 100 – 0.002 Q

Continuing, we have division E is a price taker. So, Pdemand for the final product: Pf = 100 – 0.001 Q . TCp = 70,000 + 15Q + 0.005 Q2 ; TCm = 30,000 + 10 Q .MCp = dTCp/dQ = 15 + 0.01 Q; MCm = dTCm/dQ = 10MC = MCp + MCm = 25 + 0.01 Q ; MR = 100 – 0.002 Q

- Equating MR & MC, we have
- 100 – 0.002 Q = 25 + 0.01 Q .
- So 75 = 0.012 Q
- & Q = 75/0.012 = 6,250 .
- So the price of the intermediate product is Pi = MCp = 15 + 0.01 (6,250) = $77.50 .
- The price of the final product is Pf = 100 – 0.001 Q = 100 – 0.001 (6,250) = $93.75 .
- Plugging the quantity 6,250 into the two total cost functions & adding, we find TC = TCp + TCm = $451,562.50 .
- The total revenue is TR = Pf Q = (93.75) (6250) = $585,937.50 .
- So the firm’s profit is TR – TC = $134,375 .

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