微观经济学的几个试题(英文)____ 9. A 5 percent increase in the price of s

微观经济学的几个试题(英文)
____ 9. A 5 percent increase in the price of sugar reduces sugar consumption by about 10 percent. The increase causes households to
A. spend more on sugar.
B. spend less on sugar.
C. spend the same amount on sugar.
D. consume more goods like coffee and tea that are complements of sugar.
spend on 指的是花的钱吧,那不可以衡量啊
____ 32. If a firm can produce the same level of output when it uses more one unit of labor while using less two units of capital, MRTSLK is
A. 0.5.
B. 2.
C. 1.
D. 4.
这个怎么算,什么比什么
____36. For a firm in a perfectly competitive market, the short-run equilibrium means that
A. P=the lowest AC.
B. P=MC.
C. there not exist economic profit.
D. there not exist economic loss.
这个问题的CD是怎么回事,为什么选A
____ 40. In a perfectly competitive market the prices of factors X, Y, and Z are respectively $6, $4, and $1, while their marginal products are respectively 12, 8, and 2 units with the price of $1 each unit, therefore,
A. marginal revenue of X, Y, and Z is respectively smaller than its price.
B. marginal revenue of X, Y, and Z equals respectively to its price.
C. marginal revenue of X, Y, and Z is respectively bigger than its price.
D. the above answers B, and C are true.
其实我不明白这个题