What kind of money is a gold certificate considered to be?

commodity

fiat

representative

currency

The correct answer is "representative money".

Gold certificates are documents which are held by gold owners who keep them instead of keeping the actual amounts of gold.

Representative types of money are defined as mediums of exchange which represent a face value but, meanwhile, the product itself (the paper in this case) has no value on its own. There is always something valuable (the gold, in this example) backing the face value represented.

Representative money is a kind of money gold certificate considered to be representative.