若线性需求曲线Q=4-2P,则当P=1时,需求价格弹性(绝对值)为()。
A.2
B.1
C.0.5
D.0.25
A.2
B.1
C.0.5
D.0.25
第1题
设有常系数齐次线性微分方程组,A为二阶常数矩阵,记p=-trA,q=detA,设p2+q2≠0,试证
(1)当p>0且q>0时,零解渐近稳定;
(2)当p>0且q=0;或p=0且q>0时,零解渐近稳定;
(3)其它情形下零解都不稳定.
第3题
若某种商品的需求为(),即价格升(降)的百分率与需求减(增)的百分率相等,此时价格P与需求量Q的乘积为定值,因此价格变化与消费者支出(或销售者收入)无关。
A.缺乏弹性
B.单一弹性
C.富有弹性
D.完全弹性
第6题
A.相对原点缩小
B.绕原点旋转
C.不变化
D.对原点对称变换
第7题
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.
第9题
如果劳动力需求曲线是(),则当工资率上升时,该类劳动力的工资总量保持不变。
A.富有弹性的
B.缺乏弹性的
C.没有弹性的
D.单位弹性的