Izaak likes to eat pizza and to fish. the more fishing he does the happier he is, up to 8 hours a day. If he fishes longer than 8 hours he gets a sore back and is less happy than if he hadn't fished at all. For y less than or equal to 8, his utility function is U(x, y)=x+6y, where x is money spend on pizza and y is hours per day spent fishing. His income is $45 a day and he has no expenses other than pizza. The Bureau of Fisheries has just decided to allow people without fishing licenses to fish 3 hours a day. But if you buy a fishing license, you can fish as many hours as you wish. How much is Izaak willing pay for a license? a.$33 b.$30 c.$48 d.$28 e.$0 我先写上我以前学姐的的笔记 她的作法先是把x(income)=45和y(time spend on fishing)=3 代入utility function→U=45+6*3=63 到目前为止我还看得懂她在写甚麽 不过接下来的式子就是45-m+6*8=63 然後m=30答案就出来了 有哪位高手可以解释为什麽第二个式子可以这样算吗? 还是她省略了甚麽步骤? 感谢~<(_ _)> --

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