618 points (5.7%)
After learning that core consumer prices had risen 0.4% more than expected investors got rid of technology stocks in droves. The sell-off spread to other industries causing all 30 stocks in the Dow to fall, a drop of almost 618 points, while all but 16 of the Standard & Poor's 500 Index stocks sank as well. Between Monday and Friday of that week investors lost a total of $2 trillion.
Next September 17, 2001