Commandment No. 10: Don't Trade Flow

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 "Ten Commandments of Trading." For more about the new book and to order it, click here. To learn his "Twenty-Five Rules of Investing," click here. Today, we present Cramer's tenth trading commandment. Read more about his trading commandments:

1. Keep It a Trade
2. First Loss Is Best
3. Take Your Losses
4. Trading Gains, Not Investment Losses
5. Tips Are for Waiters
6. No Sale? No Profit
7. Control Your Losses
8. Don't Fear That You'll Miss Anything
9. Don't Trade Headlines

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Watching the tape is a loser's game, unless you remember that there are sellers as well as buyers at work. I point this out because I really and truly think that most people see "takes," or buys of stocks, and they want to go take those stocks themselves. ...