# 41-310 Assignment 2 Due on Nov. 16 (Monday), 2:30pm. (Please turn it

41-310 Assignment 2 Due on Nov. 16 (Monday), 2:30pm. (Please turn it

in at the beginning of the class.)

1.

Player 2

Left Right

Player 1 Top 4,4 0,6

Bottom 6,0 1,1

For the game as shown above,

a. which strategy is the dominant strategy for P1?

b. Write down the dominant strategy equilibrium.

c. The dominant strategy equilibrium payoffs (1,1) are not optimal. Is

it possible to change the game with a transfer (or penalty) between the two

players so that the dominant strategy equilibrium of the new game becomes

efficient? Find the transfer and represent the new game after the transfer.

2. (GHG) There are 40 identical countries in the world. Facing a decision

making problem of maintaining a steady economic growth and reducing

GHGs, each has two choices: Reduce GHGs (R) and Not to reduce

GHGs(NR). If a country chooses NR, then the economy grows faster, and

the faster growth generates an additional estimated economic value of 20

billion dollars. But it increases the level of GHGs in the atmosphere, and its

negative impact imposes the cost of $1 billion on each and every country

in the world. If a country selects R, then its economy grows slower, the

slower growth generates an additional estimated economic value of only 5

billion dollars. In this case, there is no increase in GHGs in the atmosphere,

and hence no negative impact.

(a) Show that R is dominated by NR for a country.

(b) Find the total (social) maximum surplus and the minimum surplus

(or maximum loss).

(c) Explain the reason why the minimum surplus, not the total maximum

surplus, is likely to be the outcome these countries collectively select.

3. Two countries, country 1 and country 2, select either Abate or Pollute.

Each country has two types of individuals, Ninenine and Topone. Individuals

receive two types of gains(or losses); economic gain and non-economic gain.

Assume that Ninenines only receive non-economic gain and Topones only

receive economic gain.

If there are no Topones and only Ninenines in both countries, then the

game is represented as shown below.

1

Country 2

Abate Pollute

Country 1 Abate 0.5, 0.5 0.4, 0

Pollute 0, 0.4 -0.1,-0.1

If there are only Topones without Ninenines in both countries, then the

game is represented as shown below.

Country 2

Abate Pollute

Country 1 Abate -8, -8 -9, 12

Pollute 12, -9 10, 10

a. Suppose that there are 50 Ninenines and 1 Topone. Find or represent

the game that the two countries are playing. And find the dominant strategy

equilibrium of the game.

b. If the non-economic gains are ignored in each country, what will be

the expected choices made by the countries? Explain why it is suboptimal.

c. Is the prisoners’ dilemma game an appropriate game that describes

the problem faced by the two countries here? Explain.

4. Individuals A and B both enjoy flowers (public good). The MWTP curves

of flowers are given by MW T P(A) = 60-x for A and MW T P(B) = 120-2x

for B where x is the level of flowers. Suppose individual A is the only one

who produces good x (Only A knows how to garden.) The marginal cost

(MC) of producing the good is given by MC = x.

1. Find the level of flowers that maximizes A’s welfare.

2. Find the socially efficient level of flower

3. Discuss why the inefficient allocation obtained in 1 is a likely outcome

and how a subsidy to A may leads the economy to a socially optimal

allocation.

5. Suppose that there are two countries in the world, C1 and C2, whose

marginal benefit curves are given as follows. MB1 = 100 – G1 and MB2 =

60-2G2 where G1 and G2 are the levels of emission by C1 and C2 respectively.

Both countries agreed on putting a cap on the level of CO2 emission, 50

million (mega) tons each and 100 total.

(1) Find the efficient distribution of 100 units of the total emission.

(2) Suppose that the international market price for carbon is given by

$10 per unit, i.e., an unlimited amount of carbon credits is bought and sold

at price $10. How many units of carbon credits will C1 buy or sell and how

many units of carbon credits will C2 buy or sell?

2

(3) Suppose there is a demand from individuals who purchase the permits

to reduce GHGs.The demand is given by D(or G3) = 20 –

1

2

p. Find the

equilibrium market price, and the distribution of permits, G1, G2 and G3 at

the equilibrium price.

3

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