Economists could easily be beaten by monkeys at trying to predict the evolution of the Dow Jones index...
And if you don't have a monkey under hand, try this. Use a dart board. Put stock names on the dart board; throw the darts; buy the stocks on which the darts landed. One time out of two, your portfolio will outperform the portfolios of the best Wall Street analysts, who happen to be, guess what, economists...
http://www.investorhome.com/darts.htm
Economists, what a joke... And to prove it, here are three.
Why did God create economists?
To make weather forecasters look good.
How many economists does it take to change a light bulb?
None. According to the economics theory, if the light bulb needed changing the market would have already done it.
Three economists went hunting, and saw a large moose. The first economist fired, but missed, by a meter to the left. The second economist fired, but also missed, by a meter to the right. The third economist didn't fire, but said, "Well on average, we got it!"
Never let the facts get in the way of a good theory.