Far from being the root of all evil, money is one of the most spectacularly useful human inventions. On par with the technology of a wheel, the technology of money has made civilization as we know it possible. But what kind of technology does money replace?
Narayana Kocherlakota (JET 1998) argues that money is a form of memory. Here is an example: John has apples and wants bananas. Mary has oranges and wants apples. Paul has bananas but wants oranges. When John and Mary meet, John can accept money from Mary in exchange for apples and us...