Is Your Stock Worth Owning Today?

The two toughest questions any investor has to answer are:

  • Is this stock worth buying? And,
  • Is this stock worth selling?

Get those two questions right and everything else pretty much just falls into place.

The trouble is that it's not entirely straightforward to figure that out. The problem starts with the fact that investing is all about predicting a company's future earnings and then backing up those earnings to what they're worth today. In theory, that sort of discounted cash flow analysis should tell you exactly what the company's shares should fetch today.

How's that prognostication working out for you?
The catch, of course, is that the future isn't entirely knowable. The economy changes. The market changes. Competition changes. Innovations change the way we work, play, and interact. All of them can radically affect our investments in previously unfathomable ways. And frankly, my crystal ball broke years ago, and it never really did work right in the first place.

As investors, all we can really do is follow a four-step process:

  • Make our best projection of what that future will bring,
  • use that projection to estimate what a company is truly worth,
  • compare that estimate to where the market is pricing it today, and
  • incorporate a "margin of safety" to make our buy and sell decisions.

Ben Graham would be proud
That simple four-step process serves as the heart and soul of value investing, the strategy that Ben Graham first codified and that made his more successful pupils like Warren Buffett into billionaires. It's such a time-tested approach that has performed so well for so long that even those that believe in efficient markets have carved out a "value anomaly" to acknowledge its success.

At value investing's core is that "margin of safety," which is nothing more than a fudge factor added to your analysis to acknowledge that you can't possibly perfectly predict the future. So you take that best estimate of the company's value, adjust it downward, and only buy if the stock is trading below that adjusted level. You can use that strategy on the flip side to sell, as well, looking to offload your shares only if the stock trades above your value estimate plus a fudge-factor margin of peril.

That way, you've given yourself room to be wrong and still make money. And isn't that what investing is all about?

The downsides
Of course, even following the value strategy doesn't guarantee that every investment will work out. Things change, businesses fall apart, and your projections can still wind up far enough away from the mark to wind up losing money. That's why it's still important to diversify within the value strategy -- a process Graham himself likened to being a casino running a roulette wheel.

On top of that, while that market doesn't always get it exactly right, it does a pretty good job of pricing companies pretty close to the mark, most of the time. As a result, you've got to be prepared to be patient while waiting for companies to drop below your buy level or rise above your sell level.

As Buffett has said: "I never attempt to make money on the stock market. I buy on the assumption that they could close the market the next day and not reopen it for five years." That's the sort of patience that you'll need to incorporate in all of your buy and sell decisions.

So what about the stocks?
Take those Graham-inspired principles, and the following assumptions:

  • The company will grow at its analyst consensus long-term growth rate for five years,
  • it will then grow at half that consensus rate for the next five years and 2% forever beyond that,
  • you require a 12% annual return rate for the risks you're taking, and
  • the company's recent free cash flow fairly represents its typical business.

With those assumptions, you can get a first-cut estimate on approximately what a company would be worth if it exactly lives up to expectations. For instance, if you believe the analysts, the companies below would be worth what you see in the "Implied Fair Value" column:


TTM Free Cash Flow
(in millions)

Consensus Growth Rate

Implied Fair Value
(in millions)

Apple (Nasdaq: AAPL  )




Microsoft (Nasdaq: MSFT  )




Chevron (NYSE: CVX  )




Wal-Mart (NYSE: WMT  )




AT&T (NYSE: T  )




Philip Morris International (NYSE: PM  )




McDonald's (NYSE: MCD  )




Sources: S&P Capital IQ and author's calculations.

If those estimates were correct, choosing whether or not to invest would become simple. All you'd have to do would be to compare that implied fair value with the stocks' recent market capitalization, add in the fudge factor, and make your buy or sell decisions accordingly. The table below shows the comparison for those same stocks, and the decision you'd make if the valuation number were correct, assuming you had a 20% margin of safety for your fudge factor:


Implied Fair Value
(in millions)

Market Cap
(in millions)

Price Relative to Implied Fair Value

Action if the Valuation Is Correct




57.8% undervalued

Consider buying




45.4% undervalued

Consider buying




0.3% overvalued

Consider holding




22.4% overvalued

Consider selling




8.9% undervalued

Consider holding

Philip Morris International



25.8% undervalued

Consider buying




42.1% overvalued

Consider selling

Sources: S&P Capital IQ and author's calculations.

When you assume...
Of course, the big question is how accurate your assumptions are. The more aggressive those assumptions, the tougher it will be for the company involved to meet them. Take Apple, for instance. To maintain a 20% annual growth rate for the next five years, it will need to maintain all its current business and generate enough new business to add more than $50 billion in additional annual free cash flow by the end of that fifth year. Even for a rapid innovator like Apple, that's a tough challenge, indeed.

On the flip side, Wal-Mart's apparent overvalued status is due in large part to the troubles it has been having over the past few years. While its enormous size does limit its long-run growth potential, it does stand to benefit from a one-time boost as it turns its massive ship around.

Whenever you use a discounted cash flow model to value a stock, the assumptions matter a great deal in determining the usefulness of the value it suggests. Get those right, and the rest is textbook Graham.

At the time of publication, Fool contributor Chuck Saletta owned shares of Microsoft. Click here to see his holdings and a short bio. The Motley Fool owns shares of Philip Morris, Apple, Microsoft, and Wal-Mart. Motley Fool newsletter services have recommended buying shares of Wal-Mart, Philip Morris, McDonald's, Chevron, Microsoft, and Apple. Motley Fool newsletter services have also recommended creating bull call spread positions in Microsoft and Apple, as well as a diagonal call position in Wal-Mart.

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.

Read/Post Comments (8) | Recommend This Article (17)

Comments from our Foolish Readers

Help us keep this a respectfully Foolish area! This is a place for our readers to discuss, debate, and learn more about the Foolish investing topic you read about above. Help us keep it clean and safe. If you believe a comment is abusive or otherwise violates our Fool's Rules, please report it via the Report this Comment Report this Comment icon found on every comment.

  • Report this Comment On November 08, 2011, at 5:10 PM, ChrisLynn1 wrote:

    I'm lost and hesitate to display my ignorance, but here goes: What calculations are you using to obtain the "Implied Fair Value" in the 1st table above.

  • Report this Comment On November 08, 2011, at 9:17 PM, daveandrae wrote:

    I could not disagree more.

    The only question an investor should be asking himself is..... "is this business going to keep generating more and more cash over time?"

    If that answer is yes, then you don't need to ask anymore questions. The trick then becomes NOT selling the business.

    The dividend yield on the McDonald's stock that I bought in 2003 is now up to 20.58%. To sell out of a stock like this makes no financial sense whatsoever.

  • Report this Comment On November 09, 2011, at 12:18 AM, Merton123 wrote:

    Benjamin Graham mutual fund outperformed the market because he was able to minimize the standard deviation of his portfolio. If you can buy a basket of stocks according to his criteria then you end up with a standard deviation that is cut in half (i.e there is only room for zero to positive appreciation). How does this work out in the real world. Tweedy Browne mutual funds are rated 5 stars by morningstar.

  • Report this Comment On November 09, 2011, at 8:02 AM, markmcgahajr wrote:

    I understand the numbers up until he says the company will grow for "2% forever after that." Can someone walk me through the numbers and the formulas. I'm just trying to be a Fool like you.

  • Report this Comment On November 09, 2011, at 6:11 PM, TMFBigFrog wrote:

    This is a test comment -- my comments seem to be getting sucked into the ether and not posted.


  • Report this Comment On November 09, 2011, at 6:17 PM, TMFBigFrog wrote: This is a test comment with a url

  • Report this Comment On November 09, 2011, at 6:31 PM, TMFBigFrog wrote:

    Fools - my comments seem to be getting eaten by the ether. My apologies. Let's try this again. :-)

    ChrisLynn1, confused202,

    The hyperlink in the article for the words "discounted cash flow" has information on the method behind the calculation used to create the tables.

    If you need more details about the data for the actual companies, feel free to email me, via the hyperlink of my name at the article. I can send a version of the spreadsheet I used.


  • Report this Comment On November 09, 2011, at 6:33 PM, TMFBigFrog wrote:

    truthisntstupid -

    Thanks, as always, for your comments. The note to Chris was much appreciated and the blog post certainly provides an interesting perspective I hadn't entirely considered before.


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