Rule No. 15: Don't Forget About Bonds

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 fifteenth rule of investing. Read more about his rules:

1. Pigs Get Slaughtered
2. It's OK to Pay the Taxes
3. Don't Buy All at Once
4. Buy Damaged Stocks
5. Diversify to Control Risk
6. Do Your Homework
7. Don't Panic
8. Buy Best-of-Breed
9. Defend Some Stocks
10. Don't Bet on Bad Stocks
11. Don't Own Too Many Names
12. Cash Is for Winners
13. No Woulda, Shoulda, Couldas
14. Expect Corrections

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"Where are the bonds?" That's how I used to begin every phone conversation when I was on the road, away from my desk, back when I ran my hedge fund.

Yet people forget the bond market all the time. They forgot it in 2000, even though it told them the economy was softening. They forgot it in 2001, when it was clear that the cash rates were too competitive to stocks and would cause a massive selloff.

That's why I say:

Don't forget bonds.

I was trained to focus on bonds because bonds are the competition to stocks, the competition I most fear. When short-term rates go sky-high, you have to expect companies that had been bought for good yields, stocks like Bank of America(BAC Quote - Cramer on BAC - Stock Picks) or BP(BP Quote - Cramer on BP - Stock Picks), will sell off.

When long-term rates fall to 4%, you have to believe that the economy may be too soft to own deep cyclicals or that stocks that have high yields, like utilities -- I like to watch Duke Energy(DUK Quote - Cramer on DUK - Stock Picks) -- will be on the move.

You need to watch more than the stocks. If this were basketball, I would be saying that if you just watch the man with the ball, let's call him Citigroup(C Quote - Cramer on C - Stock Picks), and you don't watch what the others are doing on defense -- the bonds -- there's no way you are getting to the basket. The men without the ball -- the bond market -- can determine the action.

Many people who got in this game in the last decade still don't even know what bonds are. They are troubled when you say bonds went up today. They think that means interest rates are going up rather than what it really means, which is that interest rates are going down. If you don't understand how bonds work, I think you will not be able to make nearly as much money as if you do.

By the way, a lot of younger managers think they only need to think about bonds if they own Washington Mutual(WM Quote - Cramer on WM - Stock Picks), American International Group(AIG Quote - Cramer on AIG - Stock Picks) or Fannie Mae(FNM Quote - Cramer on FNM - Stock Picks).

They don't think bonds matter with a portfolio of Research In Motion(RIMM Quote - Cramer on RIMM - Stock Picks), eBay(EBAY Quote - Cramer on EBAY - Stock Picks) or Qualcomm(QCOM Quote - Cramer on QCOM - Stock Picks).

Wrong! When interest rates move significantly higher, no one's going to pay a lot for the future earnings growth stocks provide.

So keep your eye on the ball, and on the men without it.

	1.	Pigs Get Slaughtered		2.	It's OK to Pay the Taxes
	3.	Don't Buy All at Once		4.	Buy Damaged Stocks
	5.	Diversify to Control Risk		6.	Do Your Homework
	7.	Don't Panic		8.	Buy Best-of-Breed
	9.	Defend Some Stocks		10.	Don't Bet on Bad Stocks
	11.	Own Fewer Names		12.	Cash Is for Winners
	13.	No Regrets		14.	Expect Corrections
	15.	Know Bonds
Check back for more of Cramer's Rules