A 100-Year Curse on GOP Presidents Might Explain Why Stocks Are Tumbling

Theories abound as to why the stock market seems to be falling apart — with the Dow Jones industrial average plunging another 1,000 points on Thursday and slipping into an official "correction."

Some think this is a sign investors are scared of rising interest rates and inflation. Others believe the market simply got ahead of itself last year. And still others blame a slew of new-fangled leveraged investment funds that let investors bet on or against market volatility.