8 costly mistakes investors make continue...

No. 6: Basing happiness on wealth ups and downs

John found out today that his wealth fell from $5 million to $3 million. Jane found out that her wealth increased from $1 million to $2 million. John has more wealth than Jane, but Jane is likely to be happier. This simple insight underlies Prospect Theory, developed by Daniel Kahneman and Amos Tversky. Happiness from wealth comes from gains of wealth more than it comes from levels of wealth. While gains of wealth bring happiness, losses of wealth bring misery. This is misery we feel today, whether our wealth declined from $5 million to $3 million or from $50,000 to $30,000.

We'll have to wait a while before we recoup our recent investment losses, but we can recoup our loss of happiness much faster, simply by framing things differently. John thinks he's a loser now that he has only $3 million of his original $5 million. But John is likely a winner if he compares his $3 million to the mountain of debt he had when he left college. And he is a winner if he compares himself to his poor neighbor, the one with only $2 million.

In other words, it's all relative, and it doesn't hurt to keep that in mind, for the sake of your mental well-being. Standing next to people who have lost more than you and counting your blessings would not add a penny to your portfolio, but it would remind you that you are not a loser.

No. 7: Losing sight of your goals

Another lesson here in happiness. Mental accounting -- the adding and subtracting you do in your head about your gains and losses -- is a cognitive operation that can regularly mislead you. But you can also use your mental accounting in a way that steers you right.

Say your portfolio is down 30% from its 2007 high, even after the recent stock market bounce. You feel like a loser. But money is worth nothing when it is not attached to a goal, whether buying a new TV, funding retirement or leaving an inheritance to your children or favorite charity.

A stock market crash is akin to an automobile crash. We check ourselves. Is anyone bleeding? Can we drive the car to a garage, or do we need a tow truck? We must check ourselves after a market crash as well.

Suppose you divide your portfolio into mental accounts: one for your retirement income, one for college education for your grandchildren and one for bequests to your children. Now you can see that the terrible market has wrecked your bequest mental account and dented your education mental account, but left your retirement mental account without a scratch. You still have all the money you need for food and shelter, and you even have the money for a trip around the country in a new RV. You might want to affix to it a new version of the old bumper sticker: "I've only lost my children's inheritance."

So here's my advice: Ask yourself whether the market damaged your retirement prospects or only deflated your ego. If the market has damaged your retirement prospects, then you'll have to save more, spend less or retire later. But don't worry about your ego. In time it will inflate to its former size.

No. 8: Ignoring the benefits of dollar-cost averaging

Suppose you were wise or lucky enough to sell all your stocks at the top of the market in October 2007. Now what? Today it seems so clear that you should not have missed the opportunity to get back into the market in mid-March, but you missed that opportunity. Hindsight messes with your mind and regret adds its sting. Perhaps you should get back in. But what if the market falls below its March lows as soon as you get back in? Won't the sting of regret be even more painful?

Dollar-cost averaging is a good way to reduce regret -- and make your head clearer for smart investing. Say you have $100,000 that you want to put back into stocks. Divide it into 10 pieces of $10,000 each and invest each on the first Monday of each of the next 10 months. You'll minimize regret. If the stock market declined as soon as you invested the first $10,000, you'll take comfort in the $90,000 you have not invested yet. If the market increases, you'll take comfort in the $10,000 you have invested. Moreover, the strict "first Monday" rule removes responsibility, further mitigating the pain of regret. You did not make the decision to invest $10,000 in the sixth month, just before the big crash. You only followed a rule. The money is lost, but your mind is almost intact.

Things could be a lot worse.

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