An investor's return typically comes from three places:
The market sometimes values a stock at an amount much more that the book value contained in the companies accounting records. In such a case, the PE ratio will likely be relatively high. Why do investors buy such high priced stocks? It is because of the stocks potential for future revenue growth and the expectation of stock price appreciation.
This important principle creates the opposite of a modified internal rate or return. Thus, it creates an accelerated two-part rate of return for the investor. An example follows:
Why? The new reinvested earnings earn the companies ROE rate. Demonstrated as:
Assuming the ROE now drops to 10% and the company’s earnings are paid out to the investor as a dividend, the investment would be worth $413,575 / .10 or ~ $4,100,000. The investor’s IRR would equal ~15%.
If the residual earnings are capitalized at a 15 P/E the investors return equals ~18%. Using either scenario for the residual sale, the investor earned an above market rate of return.
In conclusion, the investor’s success depends on the ROE of reinvested earnings. Of course, the company’s ROE depends on the their ability to create products, market those products, control costs, hire and keep competent management and employees and continue to successfully employ capital over the long term – no small feat. In the end, an investor can pay a high P/E and still come out with an excess market rate of return if they pick a well managed firm with a high growth rate.
Example to show why investors pay a high PE for growth stocks
However, the investors ROE does not remain at 3% even as I assume that the companies ROE remains at the above stated rate.
Assuming the 30% ROE continues for ten years, the companies earnings will be $413,575. See also