(Lecture 4-6, Due at 5 pm, Nov. 16, 2009, submitted out of class*) *For detail, see the course syllabus (Chinese version).
Section 1: Textbook Exercises
(All numbers refer to “Problems and Application” part in each chapter) Ch4, 2, 4, 5, 6, 8, 12, 14, 15 Ch5, 1, 2, 5, 7, 8, 9, 13, 15, 17 Ch6, 1, 3, 6, 7, 11, 13, 14
Section 2: Supplemental Questions
(Multiple choice question if marked with a-d, otherwise True/False questions.) (For chapter 4)
1. For a competitive market, which of the following statements is correct? a. A seller can always increase her profit by raising the price of her product.
b. If a seller charges more than the going price, buyers will go elsewhere to make their purchases.
c. A seller often charges less than the going price to increase sales and profit.
d. A single buyer can influence the price of the product, but only when purchasing from several sellers in a short period of time.
(For chapter 5)
2．Suppose a producer is able to separate customers into two groups, one having a price inelastic demand and the other having a price elastic demand. If the producer's objective is to increase total revenue, she should a. increase the price charged to customers with the price elastic demand and decrease the price charged to customers with the price inelastic demand. b. decrease the price charged to customers with the price elastic demand and increase the price charged to customers with the price inelastic demand. c. charge the same price to both groups of customers.
d. increase the price for both groups of customers.
(For Chapter 6) 3. Price controls a. always produce an equitable outcome. b. always produce an efficient outcome. c. can generate inequities of their own. d. produce revenue for the government.
第三部分：其他补充题目
Section 3: Extra Supplements
节能技术与能源节约（2006年春季双学位班期中测验题，对应教材第5章）
在现代社会，人们无论是上班、购物或者去郊区旅游，通常会选择驾车出行。考虑人们
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对驾车出行的需求。需求量以驾车出行的里程数（公里）来衡量，价格以单位里程的耗油量（升）来衡量（忽略汽车本身的损耗）。
（1） 画出驾车出行的需求曲线。给定汽油的价格不变，为什么单位里程耗油量的增
加会减少人们的出行里程？用人对激励做出反应的基本原理加以解释。
现在，一位发明家发明了一种节能技术，能够降低耗油量。政府为了提倡节能，免费为每一辆汽车安装了这个节能技术。
（2） 这个事件会对驾车出行的需求造成怎样的影响？用图形解释之。 （3） 节能技术的使用一定能够导致汽油需求量的下降吗？仔细解释之。你的答案在
短期和长期会有所不同吗？
（4） 假定网络与通讯技术的发展减少了人们出行的必要性。这会导致出行需求怎样
的变动？是否一定会导致汽油需求量的下降？
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