2,对于枪的需求上升 并不能减少枪支犯罪,为什么呢?
3,Can you detect any problems in this estimated demandequation for an inferior product x?
Qx = 3.8 + 0.77Px +2.3Pc – 1.4Ps + 0.23I
where
Qx= quantity demanded of x, Px = price of x, and Pc = priceof a complement of product x and Ps isthe price of a substitute of product x, and I is incomes.

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