Did a glitch spark the stock plunge?

In class on Monday, we saw that most of our stocks that we had invested in earlier in the semester had gone down within the last couple of days. Is there an explanation for this?

NEW YORK (Reuters) - A spine-chilling slide of nearly 1,000 points in the Dow Jones Industrial Average, its biggest intraday points drop ever, led to heightened calls for a crackdown on computer-driven high-frequency trading.

The slide, which in one 10-minute stretch knocked the index down nearly 700 points, may have been triggered by a trading error. Major stock indexes eventually recovered from their 9 percent drops to close down a little more than 3 percent.

But the follow-through selling that pushed stocks of some highly regarded companies into tailspins exacerbated concerns that regulators can quickly lose control of the markets in a world of algorithmic trading.

High-speed trading, which uses sophisticated computer algorithms based on specific scenarios to automate transactions at speeds in the millionths of a second, now accounts for about 60 percent of U.S. equity volume.

"The potential for giant high-speed computers to generate false trades and create market chaos reared its head again today," Senator Edward Kaufman said in a statement.

"The battle of the algorithms -- not understood by nor even remotely transparent to the Securities and Exchange Commission -- simply must be carefully reviewed and placed within a meaningful regulatory framework soon."

continued... http://bit.ly/bqshow