假设你在管理一座营运成本基本上为零的收费桥。过桥需求的Q由P=15-(1/2)Q给出。(1)画出过桥服务

假设你在管理一座营运成本基本上为零的收费桥。过桥需求的Q由P=15-（1/2)Q给出。（1)画出过桥服务

假设你在管理一座营运成本基本上为零的收费桥。过桥需求的Q由P=15-(1/2)Q给出。

(1)画出过桥服务的需求曲线。

(2)如果不收费，会有多少人通过该桥？

(3)如果过桥费是5美元，相对应的消费者剩余的损失是多少？

(4)该收费桥的运营方打算把价格上升至7美元。在这一相对较高的价格上，会有多少人通过该桥？该收费桥的收益是上升还是下降了？从你的答案出发，你对需求弹性有何判断？

(5)求与价格从5美元上升到7美元相对应的消费者剩余的损失。

Suppose you are in charge of a toll bridge that costs essentially nothing to operate. The demand for bridge crossing Q is given by P=15-(1/2)Q.

a. Draw the demand curve for bridge crossings.

b, How many people would cross the bridge if there were no toll？

C. What is the loss of consumer surplus associated with a bridge toll of $ 5？

d. The toll - bridge operator is considering an increase in the toll to $7. Al this higher price ,how many people would cross the bridge？ Would the toll bridge revenue increase or decrease？ What does your answer tell you about the elasticity of demand？

e. Find the lost consumer surplus associated with the increase in the price of the toll from $5to $7.