The true value of a currency comes from its use in transactions, and a necessary condition for being useful in transactions is roughly stabilising the price level.
^That post is kind of easily debunked by the Peter Schiff paraphrase, "I need this currency to pay taxes so they won't throw me in prison".
Value through coercion. Keynesians like this guy not only accept it as the norm, but like to see just how far they can expand on the idea.