Dow rallies 336 points on interest-rate cut

Stock futures started the day on a positive note, turning sharply higher in reaction to a wider-than-expected decline in August's producer price index (PPI) number. Despite thin volume during the morning hours, the major indices hovered in the black, awaiting the 2:15 interest-rate decision from Ben Bernanke and the Federal Open Market Committee.

Pleasantly surprising even the doves among us, the rate-setting board made an aggressive rate cut of 50 basis points to 4.75%. And ... they were off. Nearly all market sectors closed in positive territory, led by strong gains from the housing and financial-services groups (areas that have been most adversely affected by the recent credit crunch and subprime woes).

By the time the closing bell sounded, the Dow Jones Industrial Average (DJIA) had gained 336 points - the blue-chip index's biggest single-day jump in almost half a decade. With 29 of its 30 components closing above break-even - Boeing (NYSE: BA) was the lone exception - the Dow settled at 13,739.4, closing above the 13,700 level for the first time since July 25.

Elsewhere, the S&P 500 Index (SPX) tacked on 43 points, or 2.9%, to 1,519.78. Today marked the index's first close above the psychologically significant 1,500 threshold since July 25. And tech stocks weren't left out of the fun ... the Nasdaq Composite (COMP) rallied 70 points, or 2.7%, to 2,651.7, taking out the 2,650 mark for the first time since July 23. All three of the major market averages ended the session at their intraday highs.

Beth Gaston Moon is an analyst at Schaeffer's Investment Research.