In my talk last week at the Mercatus Conference on Monetary Rules for a Post-Crisis World, I discussed how monetary rules and the thinking about monetary rules have developed over time. The point that I started with was that monetary rules become necessary only when the medium of exchange has a value that exceeds the cost of producing the medium of exchange. You don’t need a monetary rule if money is a commodity; people just trade stuff for stuff; it’s not barter, because everyone accepts one real commodity, making that commodity the medium of exchange. But there’s no special rule governing the monetary system beyond the rules that govern all forms of exchange. the first monetary rule came along only when something worth more than its cost of production was used as money. This might have happened when people accepted minted coins at face value, even though the coins…
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