When the marginal product of labor falls, the marginal cost of output ( )
A. falls, then rises.
B. becomes negative.
C. rises.
D. remains constant.
查看答案
The minimum points of the average variable cost and average total cost curves occur where ( )
A. the marginal cost curve lies below the average variable cost and average total cost curves.
B. the marginal cost curve intersects those curves.
C. wages are the lowest.
D. the slope of total cost is the smallest.
Economies of scale ( ) a.
A. change in the size of operations and therefore is
B. long-run consideration. b. requires
C. more intensive use of existing plant and therefore is
D. short-run consideration. c. means that
E. doubling of plant size will double output. d. requires
F. change in the size of plant and therefore is
G. short-run consideration.
The commercial value of ivory is a threat to the elephant, but the commercial value of beef is a guardian of the cow. This is because ( )
A. the cow is raised in developed economies while the elephant lives primarily in less-developed nations.
B. cows are private goods while elephants tend to roam without owners.
C. cows and elephants are public goods, but ivory is nonrival.
D. ivory is nonrival and nonexclusive but beef is rival and exclusive.
按照价格和所付出的努力将消费品分为哪几类？
A. 便利品
B. 选购品
C. 特殊品
D. 非渴求产品
微信支付 
支付宝支付