Hey so I looked through the OP but if it's there I must have missed it. My question is; Is ammunition the only form of common currency, or is it just a very valuable thing to trade?

I imagined things like coins and such would have been a surviving factor considering how built up Dust has become, but it's easy to understand if there are many forms of currency. I just realized that bullets seems to be the only one properly mentioned so I thought I'd look for clarification since I'd imagine people wouldn't be buying bread with shot gun rounds :P.