So, I was musing about life in a post-apoc science fantasy world while students took finals, and I got to thinking about economics, which I'm sure is a topic someone more coherent and thoughtful than me has already written. Regardless, I figured that in a region where political and social stability has combined with trade within and between communities at least loosely allied, a monetary system will have developed. In Mutant Future, this means the use of copper, silver, and gold pieces as currency. This currency would not, of course, replace barter and trade as means of economic exchange.
I also figured that people wouldn't go around calling copper pieces "copper pieces", et cetera. They'd have more idiomatic ways of referred to units of exchange. Here's what I came up with, which assumes that the distant post-apoc future includes English:
Coins. 1 scratch = 1/10 sawbuck = 1/100 moola
Barter. 1 grunt = 3 scratch, 1 vittle = 20 scratch, 1 shaker = 100 scratch
Obviously, a scratch equals a copper piece, a sawback a silver pieces, and a moola a gold piece. A grunt equals one day's worth of what nowadays is unfairly referred to as unskilled labor. A vittle is the cost of a basic meal. Nothing fancy, but more than subsistence level. A shaker equals a pound of salt. Units of exchange could be mixed and matched.
Now, to be honest, this is probably more trouble than I'd ever take with any game I ran, but I do like this sort of information lurking in the background. Also, it kept me from nodding off during the excitement of watching students take tests.