課程名稱︰ 經濟學原理與實習上 ECON1004
課程性質︰ 經濟學系、會計學系、財務金融學系、國際企業學系 必修兼A5*通識
課程教師︰ 林明仁
開課學院： 社科院
開課系所︰ 經濟學系
考試日期（年月日）︰2016-11-11
考試時限（分鐘）：170分，作答於答案紙上
試題 :
Part I 選擇題（30%，須附解釋，選項正確而解釋正確，得 3 分；選項錯誤而解釋正確，
得 2 分。）
1. Mr. Caterpiller is a NTU college student, he decides to spend hours playing
3D jigsaw puzzle instead of attending his Principle of Economics class.
What's his opportunity cost of playing ?
(A) The cost of buying the jigsaw puzzle.
(B) NT$378, because the minimum wafe ids NT$126/hour.
(C) No opportunity cost, because his utility from solving the puzzle is
larger thantaking the class.
(D) The value of the knowledge he would have received if he attended class.
2. Suppose the Queen of Heart's government impose a binding price ceiling for
gasoline as Figure 1 below,in which of the following cases will such policy
give rise to the most serious shortage?
(A) Both damand and supply are inelastic.
(B) Both demand and supply are elastic.
(C) Demand is elastic whereas supply is inelastic.
(D) Demand is inelastic whereas supply is elastic.
3. If an increase in the price of good X cause the demand for good Y to decre-
ase, it can be concluded that
(A) X and Y are complments.
(B) X and Y are inferior goods.
(C) X and Y are normal goods.
(D) X and Y are substitutes.
4. Suppose a producer is able to separate customers into two groups, one hav-
ing an inelastic demand and the other having an elastic demand, If the pro-
ducer's objective is to increase total revenue, she should
(A) increase the price charged to customers with the elastic demand and de-
crese the price charged to customers with the inelastic demand.
(B) decrese the price charged to customers with the elastic demand and inc-
rease the price charged to customers with the inelastic demand.
(C) decrese the price to both groups of customers.
(D) increase the price for both groups of customers.
5. What would happen to the quilibrium price and quantity of lattes if coffee
shop s began using a machine that reduced th number of clerks making steam-
ed milk, the price of milk decrese, and scientists recently discovered that
coffe can prevent heart attacks?
(A) Both the equilibrium price and quantity would increase.
(B) Both the equilibrium price and quantity would decrease.
(C) The equilibrium price would increase, and the effect on equilibrium
quantity would be ambiguous.
(D) The equilibrium quantity would increase, and the effect on equilibrium
price would be ambiguous.
6. Table 1 gives you information on the total cost of White Queen's white pro-
duction. Do White Queen produce white dress in the short run? What is the
marginal cost of producing the 32th whit dresses?
┌───────────────────────────────────┐
│Table 1 │
├─────────┬─────┬─────────┬─────────┤
│Quantity of dress │Total Cost│Quantity of dress │Total Cost │
├─────────┼─────┼─────────┼─────────┤
│0 │$50 │30 │$140 │
├─────────┼─────┼─────────┼─────────┤
│10 │$90 │40 │$190 │
├─────────┼─────┼─────────┼─────────┤
│20 │$110 │50 │$260 │
└─────────┴─────┴─────────┴─────────┘
(A) No, $5
(B) Yes, $3
(C) No, $3
(D) Yes, $5
Part II 計算題(30%，須附計算過程。僅有答案而未附計算，不給分。)
1. (10%)White Rabbit consumes two goods, carrot and pocket watch.The price of
carrot is $2, the price of watch is $5, and his income is $1000. White
Rabbit always spend 40 percent of his income on carrot regardless of the
price of carrot, th price of watchm or his income.
(1) What's his price elasticity of demand for carrot?
(2) What's his cross-price elasticityof demand for carrot with respect to
the price of watch?
(3) What's his income elasticity of demand for carrot?
2. (10%)Cheshire owns a Cat doll company. Suppose that cat doll market is per-
fectly competitive, with the price of a doll is $20. Cheshire's company has
the following total cost and marginal cost function:
TC(q) = 500 + 0.1q^2
MC(q) = 0.2q
(1) What part of the total cost function represents fixed cost?
(2) What's the average variable cost?
(3) Compute the number of Cat doll that Cheshire's company will produce to
maximize profit.
(4) Compute the average total cost of producing the profit-maximizing quant-
ity of Cat doll.
(5) What's the average variable cost of producing the profit-maximizing qua-
mtity of Cat doll? Will this company continue to operate or will it shut
down(assume the production xost is the only cost of the company)?
3. (10%)Marry Ann has decided to spend %40 his month on CDs and movies. The to-
tal benefits you receive from different quantity of CDs and movies are shown
in Table 2 below. The price of a CD is $10 and the price of a movie is $10.
┌────────────────────────────────────┐
│Table 2 (P.S. Ttl = Total , Bfit = Benefit) │
├──────┬─────┬────────┬──────────────┤
│Quantity(CD)│Ttl Bfit │Marginal Benefit│Marginal Benefit per Dollar │
├──────┼─────┼────────┼──────────────┤
│0 │0 │x │x │
├──────┼─────┼────────┼──────────────┤
│1 │200 │200 │20 │
├──────┼─────┼────────┼──────────────┤
│2 │360 │160 │(A) │
├──────┼─────┼────────┼──────────────┤
│3 │500 │(B) │14 │
├──────┼─────┼────────┼──────────────┤
│4 │620 │120 │12 │
├──────┼─────┼────────┼──────────────┤
│Q(movie) │Ttl Bfit │Marginal Benefit│Marginal Benefit per Dollar │
├──────┼─────┼────────┼──────────────┤
│0 │x │x │x │
├──────┼─────┼────────┼──────────────┤
│1 │140 │140 │(C) │
├──────┼─────┼────────┼──────────────┤
│2 │260 │120 │12 │
├──────┼─────┼────────┼──────────────┤
│3 │360 │(D) │10 │
├──────┼─────┼────────┼──────────────┤
│4 │440 │80 │(E) │
└──────┴─────┴────────┴──────────────┘
(1) What are (A), (B), (C), (D), (E) in the table above?
(2) What combination of CDs and movies optimizes Mary Ann's total benefits?
Write down the equation and explain your reasoning
Part III 簡答題(40%，須附推論。僅有答案而未附推論，不給分。)
1. (5%)Identify the cause and the effect in the following examples:
(1) Lower infant mortality and an improvement in nutrition
(2) A surge in cocoa prices and a pest attack on the cocoa crop that year
2. (5%)In 1999, the Coca-Cola Company developes a vending machine that would
raise the price of Coke in hot weather. Use a supply-demand comparative
static diagram to explain the logic behind this machine.
3. (12%)Alice consumes two goods, books and sweaters. Her income is $24, the
price of a sweater is $4, and the price of a book is $2.
(1) Suppose Alice receives $8 from his parents, draw or write down Alice's
budget set.
(2) Suppose Alice's parents had given her two sweaters for her birthday ins-
tead of giving her $8. Alice is a very polite young lady and would never
return a gift that her parents had given her. Draw or write down Alice's
budget set.
(3) Based on your answer of (1) and (2), it's possible that Alice would pre-
fer a gift of $8 to a gift of two sweaters? She would be indifferent
between a gift of $8 and a gift of two sweaters?
4. (6%)The following graph shows two supply curves with varying degrees of pri-
ce elasticity. Identify the type of elasticity of following supply/demand
curves, and take an example from our life to explain the cases,respectively.
S D
︿ ︿
Price │ ▍ Price │ ▍
│ ▍ │ ▍
│ ▍ │ ▍
│ ▍ │ ▍
│ ▍ │ ▍
│ ▍ │ ▍
│ ▍ │ ▍
└───────> └───────>
Quantity Quantity
(1) Supply Curve (2)Demand Curve
5. (7%)The following graph dipicts Mad Hatter's indiffernce curves between Soda
and Chocolate bar, describe what's wrong with his preference by this example.
（圖：兩條有交點的無異曲線，這太難畫啦QQ）
6. (5%)Use a graph to show the relationship between the marginal cost curve and
the average total cost curve for a competitive firm.
(1) What's the trend of the average total cost curve when marginal cost is
less than average total cost?
(2) What's the optiamal production of the firm?
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