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ECON1210 Introductory Microeconomics

Final Examination

2021

1.  My university ID number is [ Answer01 = 3035820825 ].

2.  The equation below shows Ben’s benefit of consuming n cups of tea and tea is perfectly divisible and can be consumed at any arbitrary quantity (say, 3.14 cups).

Total benefit (HKD):    TB (n) = 188n − 10n2

Average benefit (HKD):    AB (n) = 188 − 10n

Marginal benefit (HKD):    MB (n) = 188 − 20n

Suppose the price is HKD 24 per cup. Ben’s economic surplus from consuming tea would be HKD [ Answer02 = 672.40 ].

Please refer to the background information below to answer the following two questions.

The government hires workers to give vaccine doses at three Community Vaccination Centers: “CVC-A”, “CVC-B” and CVC-C”. The major decision is the allocation of the workers among the three CVCs, so as to maximize the amount of doses given. The following table shows the amount of doses that will be given in

these CVCs as a function of the number of workers deployed.  For instance, when 2 workers are sent to CVC-C, a total of 460 doses will be given there.

Number of Workers

CVC-A

CVC-B

CVC-C

1

162

178

248

2

308

342

460

3

448

483

644

4

578

620

780

5

690

713

911

6

777

798

1024

7

859

835

1115

8

904

868

1157

3.  Suppose 8 workers are hired. To maximize the number of doses given, the government should allocate [ Answer03A = 2 ] workers to CVC-A, [ Answer03B = 3 ] workers to CVC-B, and [ Answer03C = 3 ] workers to CVC-C.

4. Now suppose the government wants to give at least 1712 doses.  Suppose the government always allocates the N workers among the three CVCs to maximize the amount of doses given. According to the government’s allocation rule, in order to given at least 1712 doses, N must be at least equal to [ Answer04 = 10 ].

Please refer to the background information below to answer the following three questions.

Robinson and Friday are the only people on Despair, a small island. They both produce grain and meat.

Let G denote the quantity of grain, and M denote the quantity of meat. The following equations summarize their production possibility curves (PPCs) per week.

Friday:    G = 72 − 4M

5.  Suppose Despair is a closed economy. If Robinson and Friday would like to jointly consume 5 units of meat per week, they would be able to jointly consume a maximum of [ Answer05 = 70.00 ] units of grain per week.

6. In this closed economy, any admissible terms of trade between Robinson and Friday have to be larger than [ Answer06A = 4.00 ] units of grain per unit of meat and smaller than [ Answer06B = 6.00 ] units of grain per unit of meat.

7.  Suppose Despair is now opened up to trade with the rest of the world, and can trade at world terms of trade of 1.5 units of grain per unit of meat. If Robinson and Friday would like to jointly consume 5 units of meat per week, they would be able to jointly consume a maximum of [ Answer07 = 82.50 ] units of grain per week.

8.  The United Kingdom and Germany trade cars and trucks. The United Kingdom can produce one car with 50 man hours, and one truck with 140 man hours. Germany can produce one car with 30 man hours, and one truck with 102 man hours. You are on the United Kingdom team bargaining over the terms of trade under a new trade deal. You inform your team that the best terms of trade the UK can reasonably ask for are [ Answer08A = 3.40 ] cars per truck and the worst terms of trade the UK can accept are [ Answer08B = 2.80 ] cars per truck.

Please refer to the background information below to answer the following two questions.

There are two groups of consumers, A and B, with the following demand relations, respectively:

Demand A: Demand B:

P = 126 QA P = 63 QB

The market supply is

P = 0.5Q

9.  Given this information, we can compute that the market equilibrium price is [ Answer09A = 47.25 ] and the market equilibrium quantity is [ Answer09B = 94.50 ].

10.  The total consumer surplus at the equilibrium is [ Answer10 = 3224.81 ].

(i) If income decreases, the demand curve of a normal good shifts leftward.

(ii) Starting from the unregulated market equilibrium, assuming an upward sloping linear supply and a

downward sloping linear demand, consumer surplus sometimes increases and sometimes decreases

when the price is set below the equilibrium price.

(iii) Starting from the unregulated market equilibrium, assuming an upward sloping linear supply and a

downward sloping linear demand, consumer surplus always decreases when price is set above the

equilibrium price.

(iv) The supply curve shows the maximum price suppliers must receive in order to produce an additional

unit of the good.


A)  0

B) 1

C) 2

D) 3

E) 4

[ Answer11 = D ]

12. The enthusiasm of Utopian travelers for Japan has experienced a record low recently due to a recent pandemic. Suppose the exchange rate was 13.5 yen per Utopian currency before the pandemic. Other things being equal, how many of the following exchange rates (yen per Utopian currency) are more likely to prevail now?

9.5

10.5

13.5

12.5

A)  0

B) 1

C) 2

D) 3

E) 4

[ Answer12 = A ]

13. Wineries make wine from grapes. In making wine, the wineries produce grapeseed oil as a by-product. This oil is then used to cook and bake. How many of the following events would cause an increase in the supply of wine?

(i) (ii)

(iii)

(iv)

The price of grapeseed oil falls.

The price of wine rises.

A report shows the consumption of wine would increase the average happiness of parents and health-care experts advise parents to drink more wine.

The wage rate of winery workers rises.

A)  0

B)  1

C)  2

D)  3

E) 4

[ Answer13 = A ]

14.  Good X and good Y both use a common input Z for production. Suppose now we have PY  = 18 and QY  = 8. Given that an increase in demand in the market of X, other things being equal, which of the following price and quantity pairs (PY, QY ) can be true under the new equilibrium in the market of good Y?

A)  (18,8)

B)  (20,6)

C)  (16,6)

D)  (18,10)

E)  None of the above

[ Answer14 = B ]

15. How many of the following statements are correct?

(i)

(ii)

(iii