Q: Given the following information: The demand curve for a product is linear and intersects the price axis at $$50 and the quantity axis at 100 units. If the market price is 20$$, what is the total consumer surplus?

$$\frac{1}{2} \times 100 \times (50 - 20) = 1$$,500$

Q: Suppose the cost to produce a good for the marginal seller is $$15, and the market price is 25. If 20 $$units are sold, what is the total producer surplus?

$$\frac{1}{2} \times 20 \times (25 - 15) = 100$

Question 1

Suppose the demand curve for a concert ticket is linear and downward sloping. If the price of the ticket decreases from $$60 to 40$$, which of the following best describes the change in consumer surplus?

Accepted Answer

Consumer surplus increases both because existing buyers pay less and new buyers enter the market.

Question 2

A seller is willing to sell a painting for $$500, but the market price is 800. $$What is the producer surplus for this seller?

Accepted Answer

$300

Question 3

Given the following information: The demand curve for a product is linear and intersects the price axis at $$50 and the quantity axis at 100 units. If the market price is 20$$, what is the total consumer surplus?

Accepted Answer

$$\frac{1}{2} 	imes 100 	imes (50 - 20) = 1$$,500$

Question 4

Which of the following statements best describes the area representing producer surplus on a standard supply and demand graph?

Accepted Answer

The area above the supply curve and below the price, up to the quantity sold.

Question 5

If a competitive market is in equilibrium, which of the following is true?

Accepted Answer

Total surplus is maximized.

Question 6

Suppose the cost to produce a good for the marginal seller is $$15, and the market price is 25. If 20 $$units are sold, what is the total producer surplus?

Accepted Answer

$$\frac{1}{2} 	imes 20 	imes (25 - 15) = 100$

Question 7

Which of the following best explains why the equilibrium quantity in a competitive market maximizes total surplus?

Accepted Answer

At equilibrium, the value to buyers of the last unit equals the cost to sellers of producing it.

Question 8

A market for kidneys is currently illegal, and kidneys are allocated by a waiting list. If a legal market for kidneys were established, which of the following is most likely to occur?

Accepted Answer

Market efficiency would increase because kidneys would be allocated to those who value them most.

Question 9

Which of the following is an example of market failure?

Accepted Answer

A factory pollutes a river, harming people downstream who are not part of the market transaction.

Question 10

Suppose the government wants to maximize economic well-being in a perfectly competitive market with no externalities. What policy should it pursue?

Accepted Answer

Allow the market to reach equilibrium without intervention.

Question 11

If the market price is set above the equilibrium price in a competitive market, which of the following will occur?

Accepted Answer

Quantity supplied will exceed quantity demanded, resulting in a surplus.

Question 12

Which of the following best describes the difference between efficiency and equality in economics?

Accepted Answer

Efficiency is about maximizing total surplus, while equality is about distributing economic prosperity uniformly.

Question 13

Suppose a market has two sellers. Seller A's cost is $$10 per unit, and Seller B's cost is 15 $$per unit. If the market price is $20, what is the total producer surplus for both sellers if each sells one unit?

Accepted Answer

$$(20 - 10) + (20 - 15) = 15$

Question 14

Which of the following is NOT an assumption required to conclude that markets are efficient?

Accepted Answer

All goods are produced by the government.

Question 15

If a market is not perfectly competitive and one seller has market power, what is the likely effect on market efficiency?

Accepted Answer

Market efficiency decreases because price and quantity move away from equilibrium.

Question 16

A benevolent social planner wants to maximize total surplus in a market. Which formula should the planner use?

Accepted Answer

$$	ext{Total Surplus} = 	ext{Value to Buyers} - 	ext{Cost to Sellers}$$

Question 17

Suppose the supply curve for a good is linear and upward sloping, starting at a price of $$10 for zero quantity and reaching 30 at a $$quantity of 20 units. If the market price is $25, what is the producer surplus?

Accepted Answer

$$\frac{1}{2} 	imes 20 	imes (25 - 10) = 150$

Question 18

Which of the following best describes the role of the 'invisible hand' in market efficiency?

Accepted Answer

It guides self-interested buyers and sellers to maximize total surplus without central direction.

Question 19

If externalities are present in a market, what is the likely effect on market equilibrium?

Accepted Answer

The market equilibrium may not be efficient because it ignores costs or benefits to bystanders.

Question 20

A new tax is imposed on a good in a competitive market. What is the most likely effect on total surplus?

Accepted Answer

Total surplus decreases because the tax creates a deadweight loss.

Consumer Surplus, Producer Surplus, and Market Efficiency

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