It's true that dollars are more liquid. Does that mean you wouldn't accept a ton of free stuff if you couldny trade it for dollars but only other services?
That's the point - it's not free. You don't need a currency for "free". You need a currency for things which have value.
It's true that dollars are more liquid. Does that mean you wouldn't accept a ton of free stuff if you couldny trade it for dollars but only other services?