What is PEG Ratio And How to Use for Smart Stock Index Investing

Say you're considering purchasing shares of two different candy shops. Candy store A has a share price of $20 per share and its shares trade at a P/E of 20. Candy store B is $30 and it trades at a P/E of 30. At a glance, candy store A looks like a better investment but perhaps candy store B is growing its profits per share at 30% a year while candy store A is only growing at 10% per year. Now you might conclude that candy store B's stock is actually the better deal after all. 

This is where most investors make their biggest mistake. A P/E Ratio tells you how much you're paying for each dollar of earnings, however, it does not speak to growth at all. A company with a P/E of 15 could have an overpriced share price if its profits are flat, while a company with a P/E of 40 could have an underpriced stock if it is growing rapidly.

The PEG ratio (Price/Earnings to Growth) addresses this issue by including growth rates. The formula is straightforward; you divide the P/E ratio by the annual earnings growth rate. For example, if Apple's P/E is 28 and earnings are growing at a rate of 14% annually, then the PEG comes out to 2 (28 ÷ 14). If Microsoft had a P/E of 30 with earnings growing at 20%, its PEG measure would be 1.5, which may be stronger than Apple's even with a higher P/E. 

Definition and Calculation of PEG Ratio

This is how to interpret your results. A PEG below 1 indicates that the stock trades below its growth. The market has not fully baked in future earnings growth, and it may offer an attractive entry point for investors. A PEG around 1 communicates that the stock trades at fair value. You are paying a reasonable price for the growth that you receive. A PEG above 1 suggests that the stock may be overvalued. You are paying a premium that growth will not support.

Let's take Microsoft as an example, if it has a P/E of 28 and analysts expect annual earnings growth of 14%, your PEG is 2 (28 ÷ 14). This suggests that Microsoft is trading at a 2x multiple of growth. Which does not mean to sell, other factors must be considered such as brand strength and market position, but it is a yellow flag and worth taking a closer look.

Advantages and Limitations of PEG Ratio

The PEG Ratio effectively addresses a significant shortcoming of the P/E ratio. By taking growth into account, it helps to prevent two age-old errors: 1) Avoiding solid growth stocks because they look "expensive," 2) Value traps that are cheaper for a good reason! 

To begin with, it functions in all sectors and markets; a PEG of 1.2 means about the same thing whether you're studying Japanese auto manufacturers, Brazilian retailers, or American software. This universality makes it an excellent fit for global investors looking to create various portfolios. 

How to Use PEG Ratio in Stock or Index Trading

Astute investors do not simply apply the concept of PEG ratios, they utilize it in an intelligent manner to design better portfolios. The difference is all in utilizing PEG alongside other metrics, and understanding when PEG is most useful.

For starters, in screening. Many investors apply a threshold of PEG, for example, scoring anything with PEG greater than 1.5 or 2, and discarding the rest of the screen. That will immediately toss out grossly inflated stocks. But do not just screen for a PEG ratio through the industry, then in a random way. 

Global Market Case Studies of PEG Ratio

In the US market, PEG trajectories for FAANG stocks (Facebook/Meta, Apple, Amazon, Netflix, Google) varied remarkably. From 2015 through 2021, Amazon generally traded at PEGs greater than 2.5, as analysts believed there was an unending growth story. Apple, on the other hand, routinely traded between 1 and 1.8 as a fully developed company with stable, but unimpressive, growth. When the company rolled out its services revenue, and the wearables took off, Apple’s PEG continued to compress, even while the stock rallied, as growth outpaced price.

Conclusion: PEG Ratio – A Powerful Tool for Smart Investing

The PEG Ratio brings price and growth together, providing a better means to evaluate stocks than simply P/E. It won't be perfect. Growth estimates can be wrong, you can't measure unprofitable companies, and cyclical businesses distort the measurement. However, when you use it properly and in conjunction with other fundamentals, the PEG Ratio can significantly enhance your ability to identify undervalued situations and avoid overpriced ones.

The real power of PEG is consistency. After you plug it into your analysis for each stock, track it over time. Monitor shifts in market sentiment that create mismatches in valuations even though growth rates remain stable. This practice eventually trains your eye to identify disconnects in price and fundamental value in other stock purchases as well.

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