What do the years 1971, 2003 and 2010 have in common? In each year, low U.S. interest rates and the expectation of dollar depreciation led to massive "hot" money outflows from the U.S. and world-wide inflation. And in all three cases, foreign central banks intervened heavily to buy dollars to prevent their currencies from appreciating.

When central banks issue base money to buy dollars, domestic interest rates are forced down and domestic inflationary pressure is generated. Primary commodity prices go up quickly because...