The dollar keeps falling around the world, tumbling against other major currencies because investors expect the Federal Reserve to pump more money into the economy next month to try to stimulate growth.

The effects can be seen almost everywhere. Since late summer, when the Fed first hinted that it was ready to act, anticipation of the move has rippled across the economy: Stock prices have surged. So have oil prices. Commodities like gold, silver and corn have risen. Treasury yields have slid. Mortgage rates have sunk, too, along with yields on money markets and CD accounts.