News Summary: Dow drops 100
DOUBTS: A quiet day on Wall Street turned into the worst sell-off in three months after a Federal Reserve official said he doubted the bank's effort to boost economic growth would work.
STOCKS FOR SALE: The Standard & Poor's 500 index lost 15.30 points, its fourth straight decline, to close at 1,441.59.
MORE WARNINGS: Caterpillar lost 4 percent. The world's largest maker of bulldozers and other heavy equipment said late Monday that slower economic growth around the world dampened its earnings forecast.
