We hate losses more than we like gains. This principle, which the pros call "loss aversion," is a cornerstone of behavioral finance and was demonstrated by Nobel laureate Daniel Kahneman and Amos Tversky in a famous (among finance geeks, anyway) 1979 paper. Research has shown that losses may have as much as twice the psychological power of equivalent gains—in other words, the upset we'd get after losing half our portfolio is twice as big as the joy we'd get if our portfolio doubled. I don't quite understand how they measure it, but that sounds about right to me.
Put these two together, and what you get is this: When the market goes down hard, investors panic and sell, hoping to avoid further losses. Even if you know better, it's still tempting to sell—I've done it, many pros have done it, and if you've been investing for any length of time, you've probably felt the urge to sell on dips like last week's—even if you haven't actually sold.
Of course, selling on market dips is usually a bad idea, even if it is human nature. Not only do you lock in a loss, but you also pass up good buying opportunities. I probably have a dozen books on my shelves that quote Warren Buffett's famous dictum: "Be fearful when others are greedy, and be greedy only when others are fearful."
One reason Buffett's a multibillionaire while most of us aren't is that he has been able to hold on to his hat, swallow his emotions, and approach market dips rationally. He's one of many savvy value investors who buy up those good stocks that we've rushed to sell—and then make a bundle during the recoveries that follow.
How might we join them?
Grab an umbrella
It's best to think of a correction as a passing storm. You don't abandon your beach holiday and go home when a thunderstorm hits, do you?
Here are some things to keep in mind when squalls hit the market.
Don't panic. The market has always recovered. Odds are high that it'll recover this time, too. Remember that your investment horizon is years away, and corrections are often over and gone in a few weeks—and remember that you're wired to panic when you see losses, even "paper" losses. Unless your reason for owning a stock has fundamentally changed, there's no good reason to sell—even if the dip drags on for several months.
Remember that corrections often bounce. Sometimes, recoveries happen more quickly than the correction did—and even during the correction, prices will bounce up and down. Selling might increase your distress when you see prices recover a few days or weeks later. Some folks sold Apple Computer (Nasdaq: AAPL) at $135 last Wednesday—it closed near $144 just two days later. Oops.
Look for buying opportunities. It goes against our natures to plow more money into the market when things are looking bad, but... well, see that Warren Buffett quote above. For a buyer, a correction means that stocks are on a storewide sale. So take a look at your favorite stocks and see whether you can grab some bargains. Sure, they might go lower—but even if you don't get the lowest price, you can still set yourself up for good long-term gains.
If all else fails, just go to the beach. Or the lake, or the mountains, or the ice cream shop, or the library, or wherever you go when you're taking some time for yourself. Seriously: If you're fully invested in good stocks, there's really no need to do anything. Turn off your computer, skip your nightly date with CNBC, and use the business section of the Sunday paper to line the bird cage this week. If you built your portfolio using sound investment principles, those principles are still sound, even if Mr. Market is having a tough month. Have the confidence to walk away from it, and let Mr. Market work out his indigestion on his own.
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Fool contributor John Rosevear invites you to send him your comments, questions, and ideas. He owns shares of Apple. The Motley Fool has a disclosure policy.
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