# One Simple Trick to Boost Your Returns

Ted is a member of The Motley Fool Blog Network -- entries represent the personal opinion of the blogger and are not formally edited.

From highly-innovative companies like Apple to cyclical companies like U.S. Steel, investors will seemingly invest in anything as long as it might provide market-beating returns. It takes a lot of time and effort to figure out whether or not a company represents a good investment, but one free cash flow-based trick makes the task a lot easier for long-term investors who have a full-time job outside of investing -- and thus little time to spend figuring out what innovative new product Apple will come out with next.

The trick that I present in the following paragraphs automatically eliminates the vast majority of stocks in the market by defining a narrow universe of stocks from which to choose. Next, the trick whittles down the universe of possibilities to only cheap stocks within that universe. Investors who buy only cheap stocks from the select universe will likely outperform the market by a wide margin over the long run.

Step 1: Define the universe

Some investors focus on tech stocks, others are experts in retail, still others consider all stocks to be possible investments. However, the trick that I present here is designed to build a universe comprised only of companies that have a long history of stable profits.

Companies with a history of stable profitability tend to have durable competitive advantages that keep competition from lowering their profits. As a result, these companies will tend to continue earning a predictable profit year after year -- making their fair values calculable with a high degree of confidence.

We will have to use a little statistics to identify these companies. First, calculate the company's average free cash flow margin over the last ten years.

For Johnson & Johnson (NYSE: JNJ), we take each year's revenue and divide it by each year's free cash flow and then take an average of the results to get 19.87%.

After calculating the average margin, divide it into the standard deviation of the cash flow margins. The Microsoft Excel function for the standard deviation of a population is STDEVP(values). Johnson & Johnson's standard deviation is 1.81%. So, in any given year, the company's free cash flow margin is likely to be within 1.81 percentage points of the mean (19.87%). When you divide 1.81% by 19.87%, you get a coefficient of variation of .09.

A .09 coefficient of variation is extremely low. By comparison, U.S. Steel's (NYSE: X) coefficient is 3.2. Meanwhile, Weight Watchers International's (NYSE: WTW) is 0.19. Here is what the free cash flow margins look like for each:

Compared to most companies, Johnson & Johnson and Weight Watchers earn remarkably stable free cash flow margins. Most companies are like U.S. Steel, which has no durable competitive advantages and is therefore at the mercy of outside influences that largely determine what it can earn each year. U.S. Steel is the kind of company we want to throw out of our investment universe; Johnson & Johnson and Weight Watchers are the kind we want to consider.

It does an investor no good to identify a universe of consistently-profitable enterprises if she does not know how to identify the cheap ones. The second part of this trick provides an easy way to identify cheap stocks within the whittled-down universe.

First, it is important to understand what the free cash flow margin really is. For the stocks that make it passed the first cut -- Johnson & Johnson, Weight Watchers, and similar companies -- the long-term average free cash flow margin indicates how much cash the company generates in profit for each dollar it makes in sales. The companies that make it past the first step generate a predictable amount of cash as a percentage of revenues each year. Therefore, identifying cheap companies is simply a matter of applying the average free cash flow margin to a recent sales figure and comparing it to the current stock price.

For instance, Johnson & Johnson generated \$68.6 billion in sales over the last four quarters. If you apply its long-term average free cash flow margin to this figure, you get \$13.6 billion. So, in an average year, we would expect the company to generate \$13.6 billion in free cash flow on its current level of sales. If you divide \$13.6 billion by its market capitalization (\$13.6 / \$242.74), you get a free cash flow yield of 5.61%. In other words, buying Johnson & Johnson stock today is kind of like buying a bond yielding 5.61%.

The same calculation for Weight Watchers produces a yield of 14.09%. In general, you want to look for a yield in excess of 8% -- any lower, and you will be buying stocks with equal long-term prospects as the market. So, according to this trick, you would buy Weight Watchers and wait for Johnson & Johnson to fall to a lower price before buying.

By the way, U.S. Steel's free cash flow yield is 11.49%. Even though this meets our 8% threshold, we would not include the stock in our portfolio. This is because U.S. Steel's free cash flow margin is unpredictable -- meaning our calculation of normal free cash flow has a good chance of being incorrect.

Final thoughts

Full-time investors will want to take this trick one step further and identify a durable competitive advantage. Sometimes companies will earn high and stable margins many years, but suddenly succumb to competitive forces because it does not have a sustainable advantage. In addition, free cash flow is only valuable if it is properly managed, so investors will also want to evaluate management's history of capital allocation.

But most investors do not have the time or the patients to identify durable competitive advantages and prudent capital allocation. In this case, investors would be wise to simply build a diverse portfolio of 15 or 20 stocks that have a stable free cash flow margin (coefficient of variation less than 0.4) and a free cash flow yield in excess of 8%. This will generate a diverse portfolio of great businesses that are also cheap -- and will likely beat the market by a large margin.

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Ted Cooper has no position in any stocks mentioned. The Motley Fool recommends Johnson & Johnson. The Motley Fool owns shares of Johnson & Johnson. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. Is this post wrong? Click here. Think you can do better? Join us and write your own!