Trade Rules

In general, something can be sold for half its listed price.

Commodities are the exception to the half-price rule. A commodity, in this sense, is a valuable good that can be easily exchanged almost as if it were cash itself. Wheat, flour, cloth, and valuable metals are commodities, and merchants often trade in them directly without using currency. Obviously, merchants can sell these goods for slightly more than they pay for them, but the difference is small enough that you don't have to worry about it.