you still do not get it.

來源: myquestion111 於 2013-05-23 17:01:09 [] [舊帖] [給我悄悄話] 閱讀數 : (244 bytes)

if my family and your family are in one system, and we have some amount dollar to use both of us to exchange our economical product, 
if your family keep and hide all the money, system will be broken, using your brain!

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