Suppose there is an early freeze in California that reduces the size of the lemon crop. What happens to consumer surplus in the market for lemons?
A、Consumer surplus increases.
B、Consumer surplus decreases.
C、Consumer surplus is not affected by this change in market forces.
D、We would have to know whether the demand for lemons is elastic or inelastic to make this determination.

问答题

Total revenue equals
A、marginal revenue - marginal cost.
B、price/quantity.
C、price × quantity.
D、output - input.

问答题

Large or persistent inflation is almost always caused by ______.
A、excessive government spending
B、excessive growth in the quantity of money
C、foreign competition
D、higher-than-normal levels of productivity

问答题

Under rent control, landlords cease to be responsive to tenants' concerns about the quality of the housing because
A、with rent control, the government guarantees landlords a minimum level of profit.
B、they become resigned to the fact that many of their apartments are going to be vacant at any given time.
C、with shortages and waiting lists, they have no incentive to maintain and improve their property.
D、with rent control, it becomes the government's responsibility to maintain rental housing.

问答题

Macroeconomics is the study of _______.
A、individual decision makers
B、international trade
C、economy-wide phenomena
D、markets for large products.

问答题

Refer to Figure 8-3. The equilibrium price before the tax is imposed is (       ).
A、P1
B、P2
C、P3
D、P4

问答题

In the simple circular-flow diagram, households ______.
A、are the only decision makers
B、own the factors of production
C、are buyers of inputs
D、consume only some of the goods and services that firms produce

问答题

Suppose there is an early freeze in California that reduces the size of the lemon crop. What happens to consumer surplus in the market for lemons?
A、Consumer surplus increases.
B、Consumer surplus decreases.
C、Consumer surplus is not affected by this change in market forces.
D、We would have to know whether the demand for lemons is elastic or inelastic to make this determination.

问答题

When a shortage exists in a market, sellers
A、raise price, which increases quantity demanded and decreases quantity supplied until the shortage is eliminated.
B、raise price, which decreases quantity demanded and increases quantity supplied until the shortage is eliminated.
C、lower price, which increases quantity demanded and decreases quantity supplied until the shortage is eliminated.
D、lower price, which decreases quantity demanded and increases quantity supplied until the shortage is eliminated.

问答题

Refer to Figure 10-11. Which of the following statements is correct?
A、The private value of the 420th unit of output is 42.
C、The external benefit of the 420th unit of output is $27.
D、All of the above are correct.

问答题

Which of the following is not a way for the government to solve the problem of excessive use of common resources?
A、regulation
B、taxes
C、turning the common resource into a public good
D、turning the common resource into a private good

问答题

Two individuals engage in the same two productive activities. In which of the following circum-stances would neither individual have a comparative advantage in either activity?
A、One individual’s production possibilities frontier is steeper than the other individual’s production possibilities frontier.
B、One individual is faster at both activities than the other individual.
C、One individual’s opportunity costs are the same as the other individual’s opportunity costs.
D、None of the above is correct; one of the two individuals always will have a comparative advantage in at least one of the two activities.

问答题

Goods with many close substitutes tend to have
A、more elastic demands.
B、less elastic demands.
C、price elasticities of demand that are unit elastic.
D、income elasticities of demand that are negative.

问答题

Patterns of trade among nations are primarily determined by
A、cultural considerations.
B、political considerations.
C、comparative advantage
D、differences in the income elasticity of demand among nations.

问答题

 
电偶腐蚀的定义和特点是什么？

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什么是应力腐蚀开裂？

问答题

腐蚀原电池特征是什么？

问答题

石油管外腐蚀的典型腐蚀类型是（     ）
A、土壤宏电池腐蚀是管外的典型腐蚀类型
B、其他介质中电化学腐蚀
C、酸腐蚀
D、应力腐蚀

问答题

涂层保护的作用有哪些？

问答题

化学工业中，使用钛所发生的事故，几乎都是氢脆造成的，所以应用钛材料时主要的问题就是氢脆。什么是氢脆呢？