这是一篇关于经济学原理的练习题，涉及行业供给曲线的价格弹性。题目指出，在短期，行业供给曲线更可能对价格变化敏感，如果行业使用稀缺因素投入、企业低于满负荷运营、库存水平较低或产品替代品众多。同时，提供了供给函数的方程式来判断商品X的供给弹性。文章还讨论了如何计算供给量随价格变化的百分比以及大多数商品的供给弹性通常为正的情况。
上期真题答案：1.B 2.B 3.B 4.A 5.C
接下来是今天的真题，一起练起来呀~
1.
2.An industry’s supply curve is more likely to be price elastic in the short term if
A the industry uses scarce factor inputs.
B its firms are operating below their full capacity.
C its firms hold relatively low levels of stock.
D there are many substitutes for its output.
3.The supply function of good X is given by the equation
QS = 10PX
where PX is the price of the good and QS is the quantity supplied.
What can be deduced from the equation about the elasticity of supply of good X?
A It isequal to 0.0.
B It isequal to 0.1.
C It is equal to 1.0.
D It isequal to 10.0.
4.To calculate the percentage change in the quantity supplied of a good following a change in its price, the price elasticity of supply should be
A divided by the percentage change in price.
B divided by the percentage change in quantity.
C multiplied by thepercentage change in price.
D multiplied by the percentage change in quantity.
5. The price elasticity of supply for most goods is
A zero.
B between zero and –1.
C between –1 and minus infinity.
D positive
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