A.是用恒等式MV=PY定义的
B.是用恒等式MV=PT定义的
C.与货币的交易流通速度是一样的东西
D.如果交易量比收入多,它会比货币的交易流通速度小一些
A.现金
B.烟花爆竹
C.保险柜
D.电磁茶炉
E.电话
证明:者y1(x)是y"+py'+qy=f1(x)的解,而y2(x)是y"+py'+qy=f(x)的解,则y1(x)±y2(x)必是方程的解.
特别,若y1(x)和y2(x)都是方程y"+py'+qy=f(x)的解,则它们的差y1(x)-y2(x)必是对应齐次方程y"+py'+qy=0的解.
代理理论
信号传递理论
所得税差异理论
“手中鸟”理论
已知y1=x,y2=x+xex,y3=x+ex是y"+Py'+Qy=f(x)的解,则微分方程y"+Py'+Qy=0的通解为y=C1x+C2e2x。()
此题为判断题(对,错)。
莎伦有如下的效用函数:
式中,X是她对棒棒糖的需求量,PX=1美元,Y是她对浓咖啡的需求量,PY=3美元。
(1)推导莎伦对棒棒糖和浓咖啡的需求函数。
(2)假定其收入I为100美元,莎伦会消费多少棒棒糖,多少浓咖啡?
(3)收入的边际效应为多少?
Sharon has the following utility function:
where X is her consumption of candy bars, with price PX= $1, and Y is her consumption of espressos, with PY= $3.
a. Derive Sharon ' s demand for candy bars and espressos.
b. Assume that her income I= $ 100. How many candy bars and how many espressos will Sharon consume?
c. What is the marginal utility of income?