设需求函数为Q=MPn,式中M为收入,P为价格,n为常数,求需求的点收入弹性和价格弹性。
解:由Q=MPn,得EM=dQdM?MQ=1Pn?MMPn=1EP=dQdP?PQ=M?(-n)?1Pn+1?PMPn=-n
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