The parallels between the current economic fiasco and the Great Depression just keep getting stronger.

Both disasters originated with excessive leverage. In the 1930s, it was overleveraged speculators buying stocks. This time, it was overleveraged speculators buying too much house with too little cash, enabled by overleveraged financial institutions that blindly assumed housing prices would only go up, up, up.

On top of that, poorly crafted government reactions exacerbated both situations. During the Depression, the protectionist Smoot-Hawley tariff triggered global retaliation and contributed to a worldwide recession. More recently, poorly executed bank seizures and excessive subsidizing of failure have distorted the market's ability to correct its excesses. Add a dash of protectionism from the "Buy American" provisions in the recent stimulus act -- and the potential for retaliation -- and you've got quite a foundation for Great Depression II.

But what does that mean for you and your portfolio?

Can you invest through this mess?
Given those parallels, the Great Depression and its aftermath offer us some salient reminders as we slog through today's doldrums:

  • The country as a whole survived the Depression.
  • As important as debt is to the overall economy, too much debt can be deadly.
  • The soundest and strongest companies of the era survived, and later thrived.

In other words, take a deep breath. Despite all the gloom and doom (and it's real gloom and doom), this doesn't likely spell the end of life as we know it.

But until the country's debt woes are brought under control, this situation is likely to continue.  Right now, the credit markets are still pretty well frozen to all but the strongest borrowers, even prominent banks are still on the rocks, and the overall economy doesn't exactly look healthy.

All of that doesn't mean you should stay out of the market. In fact, it means that you should be invested in companies that are strong enough to survive -- and that will thrive when the recovery comes.

What to look for
A key characteristic of that strength is being able to stay out of the debt crisis that's ham-stringing companies in industries as diverse as finance, automakers, and home builders.

With financing as tight as it is today, even profitable companies can be undone by debts if they can't pay them off or refinance them when they come due. Thus, companies that have limited or avoided debt are far better positioned to ride out these trying times.

But what counts as "limited"? Here are two definitions worth considering:

  • Below half a year's revenue. This helps ensure that the debt is manageable relative to the overall size of the business.
  • Below the company's tangible equity. With sufficient tangible equity, a company can offer collateral for secured loans that may be more palatable to squeamish debt investors than typical senior unsecured bonds -- and that's crucial if the credit market is still frozen when the debt matures.

Show me the money!
Just keeping debt at manageable levels isn't enough -- you also want operational strength. That means finding companies that are profitable today and have substantial free cash flows when compared to their reported earnings.

Put together a strong balance sheet with decent earnings supported by cash flows, and you have the makings of a company with a strong chance of surviving today and thriving tomorrow. Here are just a few that fit these criteria and are worth a closer look:

Company

Debt to Revenue Ratio

Debt to Tangible Book Value Ratio

Trailing Free Cash Flow*

Trailing Earnings*

Cisco Systems (NASDAQ:CSCO)

0.17

0.31

$8,015

$7,492

Archer Daniels Midland (NYSE:ADM)

0.11

0.63

$4,043

$2,524

Accenture (NYSE:ACN)

0.00

0.00

$2,059

$1,790

Applied Materials (NASDAQ:AMAT)

0.03

0.04

$669

$565

Jacobs Engineering (NYSE:JEC)

0.00

0.03

$443

$439

Advance Auto Parts (NYSE:AAP)

0.12

0.61

$263

$238

Maxim Integrated Products (NASDAQ:MXIM)

0.00

0.00

$179

$156

*In millions.

In severe economic contractions like these, traditional measures of value like price-to-earnings ratio are much less important. Certainly, earnings still count. But if a company doesn't have the assets to support its financial structure or the cash flow to back up its earnings claims, then all the earnings in the world are meaningless.

What happens next?
Even President Obama admitted that, when it comes to the economy, "things are going to get worse before they get better." And that means preparing for the worst. If this mess truly does turn into the next Great Depression, owning shares of solid companies will position you well to ride out the storm.

And if we recover sooner than folks expect, then those strong companies will likely be among the best positioned to take advantage of weaknesses the crisis has exposed in their competitors. Whatever happens next, now is the time to focus on strengths and invest in companies with the wherewithal to persevere today and thrive tomorrow.

At Motley Fool Inside Value, our focus has always been on finding companies with solid financials and true long-term staying power. As these tough times continue, we're using that focus to pick up shares of some of the world's most resilient companies at bargain-basement prices. If you're ready to prepare your portfolio for what's left of this mess -- and the recovery that will eventually follow it -- join us today. You can start your own 30-day free trial by clicking here.

At the time of publication, Fool contributor and Inside Value team member Chuck Saletta owned shares of Maxim Integrated Products. Accenture is a Motley Fool Inside Value selection. The Fool has a disclosure policy.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.