copper pieces are pennys,silvers are dimes and golds are loonies (canadian one dollar coins if you dont know) (and platinums would be a $10 coin.)

think about it:

10 pennys are worth 1 dime and 10 dimes are one dollar

10 copper are worth 1 silver and 10 silver are one gold.

(yeah l know canada does not use pennys anymore,but they still exist,and they are made of copper.)

l dont know if this is something commonly known,its just a brain blast l had last night.

Additionally, half-dollars would be equivalent to an electrum piece (1ep = 5 sp iirc).

The coppers to pennies comparison has been made before. There is even at least 1 subtle reference to it in the rules. Detect thoughts has a material component of 1 copper piece as in "A penny for your thoughts."

True, but in D&D economy-land it would be more like a copper is $1, a silver is $10, a gold is $100, and a platinum is like throwing around $1,000.

Quote from Maestrino >>

True, but in D&D economy-land it would be more like a copper is $1, a silver is $10, a gold is $100, and a platinum is like throwing around $1,000.

 Accurate.