The debate rages on: do lofty corporate equity prices indicate an enormous speculative bubble or an emerging, tech-driven golden age? High equity valuations are naturally a basic part of the discussion, but price-to-earnings ratios (P/E ratios) alone do not fully reflect the grandeur of the expectations built into today’s stock prices. What makes market expectations remarkable is that high earnings multiples are based on profits that have already recorded extraordinary growth to the point of historically wide margins. Large multiples and remarkably wide margins together explain corporate equity values that are unprecedentedly huge in proportion to corporate operations. The United States will have to undergo a dramatic economic acceleration and an enduring, unusually rapid expansion to avoid a major disappointment for the stock market. By all appearances, stock prices will need the emergence of an AI-driven golden age if their present level is to be justified.
A number of market observers have noted that the Buffett Indicator, which is the total value of U.S. corporate equity relative to GDP, is at an exceptional record high (chart 1). For half of a century after World War II, corporate equity was at most equal to GDP and sometimes less than half of it; presently, that corporate equity is worth two-and-a-half times GDP.