Recipe....

[Zallus]

To directly quote Dungeons and Dragons, the source of GK's money:

"The basic coins are the copper piece (cp) and the silver piece (sp). These form the backbone of the monetary system and are the coins most frequently found in the hands of the common folk. Above these two coins is the much rarer gold piece (gp). This coin is seldom found in common use and mainly exists on paper as the standard money of account. This means it is used to measure the value of property and goods. Land values, ship cargoes, gemstones, and penalty bonds (royal court fines) are normally calculated in gold pieces, although payment of such vast sums normally takes other forms.

In addition to these coins, there are other unusual metals used in exchange. Most of these come from failed currencies. As such, they are viewed with skepticism by many honest folk. Principal among these coins are the electrum (ep) and platinum pieces (pp). These coins are rarely circulated, and most are hidden away in ancient treasure hoards."

I would think, even though the cp is eliminated, that most things would be charged in sp. Gp should not even be heard of, maybe lying in dungeons, but certainly no reasonable shopkeeper would accept platinum unless traded for gold at a bank, or something of that order.