Lest I be charged with entrapment, I’ll quote Uncle Bob Murphy right now:
...People today expect money to have a certain purchasing power tomorrow, because of their memory of its purchasing power yesterday. We then push the problem back one step. People yesterday anticipated today’s purchasing power, because they remembered that money could be exchanged for other goods and services two days ago. And so on.
So far, Mises’s explanation still seems dubious; it appears to involve an infinite regress. But this is not the case, because of Menger’s explanation of the origin of money. We can trace the purchasing power of money back through time, until we reach the point at which people first emerged from a state of barter. And at that point, the purchasing power of the money commodity can be explained in just the same way that the exchange value of any commodity is explained. People valued gold for its own sake before it became a money, and thus a satisfactory theory of the current market value of gold must trace back its development until the point when gold was not a medium of exchange.
Then comes a key footnote:
- Notice that fiat moneys have always emerged through their initial ties to commodity moneys. For example, we can trace back the purchasing power of U.S. dollar bills until the point when the notes were redeemable in gold or silver, and at that point we need merely explain the purchasing power of gold and silver.
Bottom line: Micah had it right the first time. His logic was impeccable. No need to modify your initial premise, Micah.
To gild the lily [excuse the pun], here is the brilliant Tim Terrel, discussing dollars:
One of the consequences of the regression theorem is that money must arise from a commodity already in general use. If there is no nonmonetary use for the good, it will not develop the widespread demand that must precede its use as a medium of exchange. As Mises’s student Murray Rothbard wrote, money “cannot be created out of thin air by any sudden ‘social compact’ or edict of government.”[2] But once a good develops a monetary nature, it is there to stay. The nonmonetary uses are no longer necessary to maintain the good’s monetary value, because there is already a set of prices based on that good.
Oh, and Rothbard too:
On the other hand, while money had to originate as a directly useful commodity, for example, gold, there is no reason, in the light of the regression theorem, why such direct uses must continue afterward for the commodity to be used as money. Once established as a money, gold or gold substitutes can lose or be deprived of their direct use function and still continue as money; for the historical reference to a previous day’s purchasing power will already have been established.*53
Gild on Macduff, with a link to the kindly Professor Shostak.