The most common coin is the gold piece (gp). A gold piece is worth 10 silver pieces. Each silver piece is worth 10 copper pieces (cp). In addition to copper, silver, and gold coins, there are also platinum pieces (pp), which are each worth 10 gp. The standard coin weighs about a third of an ounce (fifty to the pound).
Copper piece (cp)
Silver piece (sp)
Gold piece (gp)
Platinum piece (pp)
Wealth Other than Coins
Merchants commonly exchange trade goods without using currency. As a means of comparison, some trade goods are detailed below.
One pound of wheat
One pound of flour, or one chicken
One pound of iron
One pound of tobacco or copper
One pound of cinnamon, or one goat
One pound of ginger or pepper, or one sheep
One square yard of linen
One pound of salt or silver
One square yard of silk, or one cow
One pound of saffron or cloves, or one ox
One pound of gold
One pound of platinum
In general, a character can sell something for half its listed price. Trade goods are the exception to the half-price rule. A trade good, in this sense, is a valuable good that can be easily exchanged almost as if it were cash itself.