U = 45+6x3 = 63 是不买钓鱼执照的效用 M是愿意给付钓鱼执照的钱 为了使买钓鱼执照的效用 = 不买执照的效用 (买不买没差 等同於最大愿付保费定义) 故式子45-M + 6x8 = 63 其中6x8的8 是 Izaak 钓鱼花八小时 题目讲的他最大满足点 买了执照可以钓多久就钓多久 一个理性的消费者会消费直到最大满足 不知道学妹这样讲解有清楚吗?(我是经济四的学长~) ※ 引述《tomoya0711 (皇上)》之铭言： : 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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