I don't like how people are thinking of dollars and cents and exact currency worth. I say it should just be bargaining. After all, currency has no value, it is just a number on a ledger. However, even if you used ''arrows' and ''iron'' bars as someone says, that' still stupid. People are going to want iron for crafting, but will trade it. I don't use a bow, so arrows have no meaning to me. On the contrary, pick-axes have a value because they help you mine, and TNT has a value because it helps explode things. See?