Beware the Wall Street Hype

Editor's note: As a special bonus to TheStreet.com readers, we will be running an updated version of Jim Cramer's "Twenty-Five Rules of Investing," from his latest book, Real Money: Sane Investing in an Insane World. Here's Rule 23.

Amateurs and professionals alike simply don't have enough respect for the Wall Street promotion machine.

They don't realize that balls can stay in the air much longer than they should. They don't understand that analysts and firms get behind stocks -- sometimes irrationally, sometimes greedily -- and they can keep the stocks propelled in an up direction well beyond reason.

That's why I say, ...