A part I found interesting about chapter ten was when Wheelan discussed the use of mackerel as a unit of exchange in prison. I thought this was interesting because it relates back to the comic we read in class and how originally the group on the island used rocks as a unit of exchange. This really shows that in order to use anything as a unit of exchange, the people have to believe that it is valuable. A rock itself isn't valuable in the same way a dollar bill itself is just a piece of paper, but when you believe it is valuable, then it has value.
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