When I sell there, they pay me 2% over spot.
If it was deemed by the public to be a convenient form for transactions, whatever the acquisition cost worked out to be would be the trading cost also. That's how it worked when gold coins were in circulation. There's a word for it, but I cannot think of it at the moment, i.e., the cost of transforming gold or silver into the form of a coin. That cost carries over.
