98年國立政治大學國際經營與貿易學系經濟學線上測驗

1.: Evaluate the statements below and explain why they are valid or invalid.
(1) There will never be any gains from trade between two identical countries. (5%)
(2) Taipei City’s MRT (Metropolitan Rapid Transit) system is a means of public
transportation, therefore it is an example of public goods. (5%)
(3) A tax that has no deadweight loss cannot raise any revenue for the government.
(5%)

2.: A monopolistically competitive firm faces a demand curve, P = 24 −Q , and earns
zero profit. The firm produces at a constant marginal cost of 4. Find the fixed cost for
this firm. (5%)

3.: Consider a competitive market whose demand is given by Q( p) = 250 −10 p . There
are 120 identical firms in the market, each producing with a technology characterized
by the total cost function, TC(q) = 4 + q + q² , where q denotes the quantity
produced by each firm. How many firms will remain in the market when it reaches the
long run equilibrium. (5%)

4.

5.

An aluminum factory emits pollution. Suppose for each unit of aluminum produced,
the amount of smoke generated imposes a 2-dollar disutility on a villager who lives
next to the factory. The villager’s utility is normalized to zero when there is no
pollution.

6.: An increase in Honda car production in the Taiwan will increase Taiwan’s GNP but
have no effect on Japanese GDP. (6%)

7.: A high marginal propensity to consume increases the effect of any expansion in
autonomous spending. (6%)

8.: Capital accumulation by itself can sustain growth in output per worker in the long term.
(6%)

9.: Consider an IS-LM model. Suppose that there is a reduction in the budget deficit.
A. What does the reduction in the budget deficit mean? (4%)
B. Describe the effects of this reduction in the short-run on interest rates, output and
prices giving economic intuition for the changes. (8%)
C. Describe the effects of this reduction in the long run on interest rates, output and
prices giving economic intuition for the changes. (8%)

10.: Define neutrality of money. (4%) What does neutrality of money imply about the
effectiveness of contractionary monetary policy in affecting output in the short-run and
in the long-run? (8%)

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