Like you said, the Fed may have infinite money to print, but that money and the investment consumption patterns it helps define draw down on real resources which are scarce.
The Fed cannot feed this bubble ad infinitum. The fact that the Fed is continually needing to print more to support asset prices and bond prices shows the diminishing returns of their efforts which is leading toward the inevitable collapse of the Fed bubble.
They either turn of the monetary spigot and face the music or continue printing indefinitely, which as Mises said is the road to hyperinflation as confidence in the currency collapses.
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