If the supply curve is vertical， then the amount supplied is independent of price. A:对 B:错 答案: 对

The supply curve slopes up and to the right. If the demand curve shif

ts upward to a new curve which is everywhere higher than the old curve (but possibly of different slope) and if the supply curve does not shift， then the equilibrium price and quantity must necessarily increase.

A:错
B:对
答案: 对

An economic situation is Pareto optimal only if there is no way to make someone better off.

A:错
B:对
答案: 错

The demand for pickles is given by p=131-2q and supply is given by p=5+7q. What is the equilibrium quantity? 

A:11
B:19
C:103
D:14
答案: 14

The demand function for fresh strawberries is q = 200-5p and the supply function is　q=60+2p. What is the equilibrium price? 

A:50
B:20
C:10
D:40
答案: 20

If a quantity tax is collected from competitive suppliers of a good， placing a tax on the good causes the price paid by consumers to increase more than if the tax had been collected directly from the buyers.

A:对
B:错
答案: 错

The demand function for x is D(p) = 65-2p and the supply function is S(p) = 20 + p. The price that should be set to restrict quantity supplied to 30 units is closest to:

A:10
B:50
C:15
D:5
答案: 10

The demand function for rental apartments is q = 960-7p and the supply function is q = 160 + 3p. The government makes it illegal to charge a rent higher than 35. How much excess demand will there be?

A:450
B:726
C:364
D:149
答案: 450

(    )factors other than price that locate the position of a demand curve1. consumers’ tastes2. of consumers in the market3. consumers’ incomes4. the prices of related goods5. expected pricesSHIFTS the curve

A:inferior good
B:determinants of supply
C:normal good
D:determinants of demand
答案: determinants of demand

a good (or service) whose consumption declines as income rises and increases as income decreases
increase in income=decrease in consumptiondecrease in income=increase in consumption

A:normal good
B:price floor
C:substitute good
D:inferior good
答案: inferior good