Midday today, the Dow Jones Industrial average sat below 11,500, well off its yearly highs. The headlines continue to look ominous. For a while now, actually, financial headlines have been full of scary words like "recession" and "bear market."

Not without justification, of course. With the fallout of the tech bubble still fresh in our minds -- or the easy-money subprime bubble fresher still -- talk of recessions and bear markets is enough to make even the steadiest investor rethink the contents of his or her portfolio.

So, which stocks are the best to own right now?
Traditional wisdom posits that when times are gloomy, investors should flock to so-called defensive stocks. Defensive plays are generally large dividend payers operating in the health-care, consumer staples, utilities, and financial industries. So hunkering your portfolio down in Altria (NYSE:MO) and Coca-Cola (NYSE:KO) -- good companies, both -- the logic goes, will protect you from losing your shirt in a bad market. Not only will you get a steady stream of cash payments, but the stock price will be less volatile because people never stop buying things like ketchup and shampoo.

Hey, you can never have enough ketchup.

There's a reason conventional wisdom is conventional. While I wouldn't contradict that advice, I'm going to supplement it with some unconventional wisdom.

Without further ado
You should be flocking to small caps.

If you have a long-term mind-set, small caps make sense, even in tough times. A recent study done by Ned Davis Research (as reported in The Wall Street Journal) showed that since 1979, "the small-stock Russell 2000 returned a median 19.6% in the first three months after a market bottom, versus 13.6% for the large-cap Russell 1000."

That outsized figure makes all the more sense once you view the performance of these former small caps since the S&P 500's low point in early October 2002:

Company

Market Cap in October 2002*

Three-Month Return Oct. 2002-Jan. 2003

Total Return Jan. 2003-Present

Williams Companies (NYSE:WMB)

$764

116%

940%

Garmin (NASDAQ:GRMN)

$1,940

72%

127%

American Eagle Outfitters (NYSE:AEO)

$739

64%

152%

Energy Conversion Devices (NASDAQ:ENER)

$168

51%

494%

AmericanTower (NYSE:AMT)

$139

449%

997%

Source: Capital IQ, a division of Standard & Poor's.
*In millions.

It works both ways
Small caps aren't just potent coming out of a bad market -- they actually hold up pretty well during bear markets, too. In the last bear market, in fact, small-cap value stocks as a whole greatly outperformed the S&P 500 and other major indexes.

Index

Total Return (8/15/2000-3/15/2003)

S&P 500

(41.9%)

Russell 2000 Value

1.5%

So, far from being speculative plays, small caps can stay afloat in a down market and juice your returns coming out of that down market.

But the sky hasn't finished falling!
Look, all this isn't to say that you should abandon your large caps and switch everything to small caps. For one, smaller companies can be more volatile than larger companies.

Diversification is important. But keep in mind that small caps should be a part of any balanced portfolio, regardless of the current economic picture. The growth potential of small caps is simply too great to ignore.

So when you're searching the vast universe for good small-cap ideas, look for stocks with high insider ownership, a strong balance sheet, a solid business model, and compelling valuation.

If you'd like to see the small caps we're recommending in today's market, consider sampling Motley Fool Hidden Gems; since its inception in 2003, the team's picks are ahead of the S&P 500 by 20 percentage points. You can view our top five ideas for new money with a 30-day free trial.

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This article was first published June 12, 2008. It has been updated.

Todd Wenning can't give you a tab unless you order something. He does not own shares of any company mentioned, except for Procter & Gamble. Garmin is a Motley Fool Global Gains recommendation. Garmin and American Eagle Outfitters are Stock Advisor picks. Coca-Cola is an Inside Value selection. The Fool owns shares of American Eagle Outfitters. The Fool's disclosure policy is your density.