At the most basic level before we had standard money, we bartered one cow for 50 chickens.Some people got a cow for 52 chickens, some people with good negotiation skills paid only 45 chickens.

• 标准货币出现之前的最常见的交易方式是物物交换：例如用一头牛换50只鸡，有些人可能能换得52只鸡，而另一些人经过讨价还价可能只换得45只鸡。