Comment: Then only one form of money can exist by your definition

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In reply to comment: Nope. All media of exchange (see in situ)

Then only one form of money can exist by your definition

Only one thing can be MOST sale-able, but more than one thing can function as money. The only reason that dollars are MOST sale-able is the force of law. Since competing currencies are generally illegal, who can say what would be most sale-able in a free market. In addition, who is to say that multiple forms of money would not exist in a free market with competing currencies? If bitcoin had higher liquidity, it would be easier for it to function as money, but it doesn't have to be THE most liquid item on the planet to be money.

We all want progress, but if you're on the wrong road, progress means doing an about-turn and walking back to the right road; in that case, the man who turns back soonest is the most progressive.

-C. S. Lewis