With no major economic news to consider, investors cashed in on the market's recent rally.
The leading theory is that some early investors, who paid only a few dollars a share, may have cashed in.
Other analysts said the market closed down because investors were cashing in on the recent market rally.
The rally was later curbed by some selling as nervous investors cashed in and took profits.
After bidding stocks up to record levels for three straight days, investors stepped back yesterday and cashed in some of their gains.
The stock market fell for the first three days of last week as investors cashed in profits after a long rally.
The next bear market made many investors cash their funds as stock value decreased.
Elsewhere, investors were cashing in some of their stock investments.
Some analysts also said that investors cashed in on a recent surge in Delta's stock.
For the last few years, though, investors have been cashing in on commercial post-secondary education companies.