uh...well, that's debatable. And, certainly, if it were true under the gold/dollar peg, then "free markets" -- defacto -- determined the dollar's price. But that wasn't possible, because gold's price was fixed by fiat, which was when money was truly "fiat." Now, money value is determined by the market.
The gold standard was an artifice; it was training wheels. The training wheels have to come off as the child grows. Hopefully, the child grows with enough character to handle a real bicycle.
Dream on.