Following are a number of our favorite valuation metrics. Let’s take a look at them and see what the research data tell us about probable forward returns (high-priced or low-priced hamburgers):

Median P/E (Price-to-Earnings Ratio)

Think of the P/E like this. Your business has 10,000 shares outstanding, and your current share price is $10. That means your company is worth $100,000 (10,000 x $10). Now, let’s say your company earned $20,000 over the last 12 months. That works out to $2 in earnings for every share of outstanding stock ($20,000 in earnings divided by 10,000 shares). So if your stock price is $10 and your current earnings per share is $2, then your stock price is trading at a P/E of 5 (or simply $10 divided by $2 equals 5). It is simply a metric to see if your “hamburger” is pricey or cheap.

Note, this P/E calculation is based on your previous year’s earnings, not your estimated next year’s, or forward, earnings. If you expect to make $25,000 next year, then your forward P/E ratio is 4. As we will see later, optimistic earning projections can make valuations appear much better than they are. It’s like the old warning: “Objects in the mirror may be closer or larger than they appear.”

With the P/E calculation as a basic starting point, we can see if your hamburgers are expensive or inexpensive. We can look at the S&P 500 Index (a benchmark of “the market”) and we can measure what the average P/E has been over the last 52 years – call  that “fair value” or a fair price for a hamburger.

What we see is that a P/E of 5 is a really cheap hamburger. Now, I believe in you, and I believe you can grow your company’s earnings over the coming years; but, wow, if I can buy your great company at a low price, odds are I’m going to make a lot of money on my investment in you. And if I really think you’re going to grow your earnings by 25%, that could make you a bargain.

We can look at the market as if it were a single company and gauge how expensive stocks are now. Over the last 52.8 years, the median fair value for the S&P 500 is a P/E of 17 (we define what we mean by median below). That means a fair price for your company would be the $2 in earnings we already calculated, times 17, or $34 per share. If I can buy your stock for $10 per share instead of its fair value of $34, good for me.

Investors who use this approach are called value investors. I should note that, relative to the actual performance of the market, value investors have been severely underperforming for the past four or five years. They have been punished by seeing assets leave their funds and go to passively managed funds that have shown much better performance at much lower fees. (Note from John: In a few weeks I’m going to talk about the source of this underperformance and what you can do about it. This is a very serious investment conundrum.)

But what if you earn $2 per share and your stock is trading today at $48 per share, or 24 times your earnings? Well then, I’m buying a very expensive burger. So price relative to what your company earns is a good way for us to see if we should sing or weep.

Here is how you read the following chart (from Ned Davis Research):