If you took a university course in economics, you probably learnt a simple history of money. First, people bartered. But barter was difficult because you need a “double coincidence of wants”: I have to want what you have, and you have to want what I have. So people used bits of valuable metal to make the barter easier. Then paper came to represent the metal, and the paper took on value. Ta da! Money.
如果你上過大學經濟學課程，你可能學過簡單的貨幣史。首先，人們進行易貨貿易。但以物易物是很困難的，因為你需要一個“需求的雙重重合”：我必須想要你有的東西，你也必須想要我有的東西。因此，人們使用有價值的金屬來使易貨貿易更容易。然后，紙被用來代表金屬，而紙也有了價值。錢，就是這樣誕生的。
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