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.
如果你上过大学manbetx20客户端下载 学课程，你可能学过简单的货币史。首先，人们进行易货贸易。但以物易物是很困难的，因为你需要一个“需求的双重重合”：我必须想要你有的东西，你也必须想要我有的东西。因此，人们使用有价值的金属来使易货贸易更容易。然后，纸被用来代表金属，而纸也有了价值。钱，就是这样诞生的。
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