本题目来源于试卷: IB Economics Unit 2.3: Microeconomics - Elasticities，类别为 IB经济学
[单选题]
Assume the price elasticity of demand (Pksodv7(zxn1 ss2eh,3 ED) for a homeyi5r nel/oh/ ub/; 0 4r8ruwsp cleaning service changes from 1.81.8nrbrp iuw/s54r 0 /;le8/ouhy to 1.21.2. Which of the following statements explain this change?
I. a competing firm increased its operating hours
II. a competing firm begins focusing on office cleaning
III. incomes of potential customers increase
A. I only
B. I and II only
C. I and III only
D. II and III only
参考答案: D
本题详细解析:
Statement I is incorrect: if a competing firm increases its hou*lwr*f x8fg wv 1996xiggn+ gjrs, that firm is more competitive with the original firm—PED for the original firm increases.
Statement II is correct: if a f1jggxg9fr w9+*vli86 g*xwn competing firm begins to focus on other customers (offices), that firm is less competitive with the original firm—PED for the original firm decreases.
Statement III is correct: if the incomes of potential customers increase, the price of home cleaning will be a smaller proportion of income—PED for the service decreases.
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