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几道经济学的题目.The law of increasing opportunity cost indicates th

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几道经济学的题目.
The law of increasing opportunity cost indicates that____
Select one:
a.if the prices of all resources
involved in the production of goods increases,the cost of producing those goods
will increase at the same rate.
b.resources are perfectly mobile except for transportation costs.
c.the sum of all costs cannot rise above
the market price of a product.
d.to produce more of one good,society
must sacrifice larger and larger amount of alternative goods.
A point outside the PPC boundary of a nation:
Select one:
a.will shift the PPC outward.
b.all of the above.
c.implies that there are unused resources.
d.is not attainable for this nation.
Increases in resources or improvements in technology will tend to cause a society's PPC to_____
Select one:
a.become vertical.
b.none of the above.
c.shift outwards.
d.shift inwards.
第一问d.to produce more of one good,society must sacrifice larger and larger amount of alternative goods.机会成本递增,或者边际转换率递增.
第二问d.is not attainable for this nation生产不可能性区域.
第三问 c.shift outwards.外移,右上方移动.