Assume that you're selling goods on a commission basis. On the sale of a given article you will earn a commission of $100.
To date you have spent $80 promoting a certain sale that you have not yet made. You're confident taht this sale will be assured by an added expenditure of some undetermined amount.
What is the maximum amount (over and above what you already spent) that you should be willing to spend to assure the sale??

今天上工程經濟
老師教我們回答一個問題
(其實根本是變相的點名)
意思就是說你賣一個東西賺100, 現在你已經花了80打廣告
如果再花一點錢你就可以賣出去了
你最多願意花多少錢???

這個題目, 不論統計族群是賣菜的還是像我們
全班都是博士碩士生
基本上大概90%以上的人都是填差不多20左右的數字

可是答案是100

為什麼呢?