请高手帮看下两个个关于弹性和成本的问题，谢拉~~

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<p>1  The New York Times (Feb. 17, 1996) reported that subway ridership declined after a fare increase: "There were nearly four million fewer riders in December 1995, the first full month after the price of token increased 25 cents to $1.50, than in the previous December, a 4.3 percent decline.”</p><p> </p><p>(a)        Use these data to estimate the price elasticity of demand for subway rides.</p><p>(b)       According to your estimate, what happens to the Transit Authority’s Revenue when the fare rises?</p><p>(c)        Why might your estimate of the elasticity be unreliable?</p><p> </p><p>2  What is the relationship between the marginal-cost curve and the average-total-cost curve? Between the marginal-cost curve and the average-variable-cost curve? Explain.</p><p> </p><p>自己算了一下，但是十分不确定，请帮忙解决下，谢谢～～～</p><p> </p>

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关键词：relationship elasticity Increased relations Authority increase previous reported percent subway

1

a)

P1=1.25

P2=1.5

Q1=(4000000/4.3%)=93023256

Q2=89023256

E= %^Q/%^P= {(Q2-Q1)/[(Q2+Q1)/2]}/{(P2-P1)/[(P2+P1)/2]}=0.242

E<1

so it's inelastic curve

b)the total revenue increase when the fare rises because it is inelastic of demand curve

c)because it's short-run, the people don't want pay much money, when in long-run people will take new price.

[此贴子已经被作者于2008-11-21 3:53:37编辑过]

2

Whenever marginal cost is less than average total cost, average total cost is falling.

Whenever marginal cost is greater than average total cost, average total cost is rising.

The marginal-cost curve crosses the averagetotal cost curve at the minimum of average total cost.

Firm’s Long-Run Decision to Exit or Enter a Market

Firm exits if P < ATC

Firm enters if P > ATC

The Firm’s Short-Run Decision to Shut Down

If P > AVC,keep producingin the short run.

If P < AVC,shut down.

YOUR ENGLISH IS SO GOOD ,AND IT IS SO PROFESSIONAL WE CAN NOT UDDERSTAND

弹性是一种相对变化问题,而成本是包括生产等各方面在内的总消耗!精辟!