为什么呢？因为它不符合Finance中最浅显的原理：the power of compounding。
举个例子：如果你有$50，你今天一下子全花掉；跟你每天花$.50，一百天花完，在经济学上的差别是很大的。Why? In the latter case, you can deposit the $50 in the bank and start earning interest, and compound the interest over the 100 days; while in the former case, you get nothing in monetary return, except a pile of Cokes.
其次，买了50箱可乐(我见过最最便宜的Coke in Sales，也就$0.99/24-pack)，怎么存放啊？如果要放冰箱里那得多大一个冰箱啊？还有，电费怎么算？啊！
