[請益] 98北大企管

看板Economics (經濟學)作者scodowying時間13年前 (2012/07/27 00:35)推噓0(0推 0噓 0→)

留言0則, 0人參與討論串1/1

來源:98年北大企管 Q: Toby Talkalot subscribes to a local phone service that changes a fixed fee of $10 per month and allows him to place as many local phone calls as he likes without further charge. Let good 1 be an aggregate of commodities other than local phone use and let good 2 be local phone use. (Measure good 1 on the horizontal axis and good 2 on the vertical axis.) On Monday, Toby didn't use the telephone at all. The slope m of his indifference curve at the consumption bundle he chose on Monday was A)positive B)less than or equal to 0 C)0 D)greater than 0 E)negative 補習班給的答案是A(但另有詳解寫E) A的解釋是由於縱軸的室內電話費率是0 因此Toby面對的預算限制式為垂直線若他在星期一的最適選擇是角解橫軸商品表示此時無異曲線一定是正斜率選E的詳解表示:雖然星期一沒有使用~但費用已繳~無論有沒有使用電話~都視為已購買我的想法是:若把電話費率放在縱軸那他星期一沒有使用的確可看做價格下跌至無窮但為什麼角解橫軸一定表示無異曲線是正斜率呢? 有請高手解答了!謝謝!! 有在研究所問題板問過有板友說Varian的課本有這一題而答案給C 想請問看看到底要怎麼解釋呢? 現在有三個版本啦...QQ ※ 編輯: scodowying 來自: 111.249.192.166 (07/27 00:36)