...the economy? If people just left their money in the stock market, buisness wouldn't loose a ton of money, meaning business would survive, and people make money.

Also, when something happens like 911, who decides, or what makes people take their money out?

I mean, if people just leave their money in the stock market, the value of the shares can't go down. The reason the stock market is so bad, is because EVERYBODY freaks and takes their money out. Those choices are costing the business money, which then cant produce as much product.