Rule No. 4: Buy Damaged Stocks, Not Damaged Companies

Editor's note: Jim Cramer's new book, Real Money: Sane Investing in an Insane World, is available in selected bookstores now. As a special bonus to RealMoney readers, we will be running Cramer's "Twenty-Five Rules of Investing." For more about the new book and to order it, click here. Today, we present Cramer's fourth rule of investing. To read about his first rule, click here; for his second, click here; for his third, click here.

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Let's say Wall Street is holding a sale of solid merchandise that it has to move. And let's say you take that merchandise home only to find it doesn't work, has a hole in it or is missing a key part. If we were on Main Street, of course, it wouldn't matter. There are guarantees and warranties galore on Main Street. You can take anything back. ...