BUSINESS
03/21/2011 09:51 am ET Updated May 25, 2011

New Stock Market Signal Identifies Bubbles, Researchers Say

Complexity researchers who study the behavior of stock markets may have identified a signal that precedes crashes.

They say the telltale sign is a measure of co-movement, or the likelihood of stocks to move in the same direction. When a market is healthy, co-movement is low. But in the months and years before a crash, co-movement seems to grow.

Read more on Wired