In recent years, there has been a growing debate about the relevance of P/E ratios, especially the Cyclically-Adjusted Price-Earnings (CAPE) ratio popularized by Nobel Prize winner Robert Shiller. Are stock P/E ratios really elevated in today's environment? And what does that really mean anyway? Could P/E ratios simply have reached a new permanently high plateau?
Yet when the standard P/E ratio is flipped upside down, a different conclusion quickly emerges: stocks with a high P/E ratio have a low E/P ratio. And a low E/P ratio means the markets in the aggregate (or some stock in particular) simply are not producing very much in earnings relative to their current price. Which means regardless of whether the earnings are ultimately paid as dividends or reinvested for future growth for price appreciation, there just isn’t as much return available on the table.
Viewed from this perspective, perhaps the oft-maligned P/E ratio deserves more credit after all. No one would debate that bonds with a yield of 4% will likely have a lower return than bonds yielding 8%, or that rising bond yields can further dampen a bond’s total return. So if we examine equities based on their E/P ratios, and look to their earnings yield as well, is it really so controversial to expect that below-average earnings yields (and correspondingly high P/E ratios) may well lead to below-average returns in the future?