U = 45+6x3 = 63 是不買釣魚執照的效用 M是願意給付釣魚執照的錢 為了使買釣魚執照的效用 = 不買執照的效用 (買不買沒差 等同於最大願付保費定義) 故式子45-M + 6x8 = 63 其中6x8的8 是 Izaak 釣魚花八小時 題目講的他最大滿足點 買了執照可以釣多久就釣多久 一個理性的消費者會消費直到最大滿足 不知道學妹這樣講解有清楚嗎?(我是經濟四的學長~) ※ 引述《tomoya0711 (皇上)》之銘言： : 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 : 我先寫上我以前學姐的的筆記 : 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 : 到目前為止我還看得懂她在寫甚麼 : 不過接下來的式子就是45-m+6*8=63 然後m=30答案就出來了 : 有哪位高手可以解釋為什麼第二個式子可以這樣算嗎? : 還是她省略了甚麼步驟? : 感謝~<(_ _)> --

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