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1. What is the market equilibrium price and quantity? (A) p = 9, q = 10 (B) p =

ID: 1124002 • Letter: 1

Question

1. What is the market equilibrium price and quantity?

(A) p = 9, q = 10

(B) p = 9, q = 6

(C) p = 17, q = 10

(D) p = 13, q = 6

2. What is the deadweight loss from the externality?

(A) $32

(B) $16

(C) $8

(D) $64

3. What is the socially ecient price and quantity?

(A) p = 9, q = 10

(B) p = 9, q = 6

(C) p = 17, q = 10

(D) p = 13, q = 6

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The next 3 questions involve the following Figure, which depicts a negative externality: Figure 2: PPF MSC 17 MPC 13 5 Demand 6 10 Quantity

Explanation / Answer

Answer 1. (A)

The equilibrium quantity and price is determined at the point where the demand curve intersects the MPC curve , that is the Marginal Private Cost curve. The quantity is 10 units and price is 9 units at that point.

Answer 2. (C)

The deadweight loss can be calculated by the triangle in between. Area = 1/2* (13-9) * (10-6) = 8$

Answer 3. (D)

The social optimal quantity and price is given by the intersection of demand and Marginal social cost curve. Thus, the quantity is 6 units and price is 13 units.