The CAPE Ratio (Shiller PE Ratio) measures stock market affordability by adjusting past company earnings for inflation, providing valuable insights for investors.
The Cyclically Adjusted Price-to-Earnings (CAPE) Ratio, also known as the Shiller PE Ratio, is a financial metric used to assess long-term stock market valuations by adjusting past company earnings for inflation. It was popularized by economist Robert Shiller and is widely utilized by investors to determine market affordability and to predict potential future returns.
The CAPE Ratio is calculated as follows:
Where “real earnings” refers to inflation-adjusted earnings over the trailing ten years.
Investors use the CAPE Ratio to gauge if the stock market or a specific stock is overvalued or undervalued based on historical earnings performance. A high CAPE Ratio suggests that the market is overvalued, implying lower future returns, while a low CAPE Ratio indicates undervaluation with potential for higher future returns.
Empirical studies have shown that the CAPE Ratio has predictive power over long-term returns. Typically, higher CAPE Ratios are associated with lower future returns, and vice versa.
The CAPE Ratio can be used to compare different markets globally. By evaluating various stock indices using the CAPE Ratio, investors can identify which markets might offer better investment opportunities.
Different industries have varied historical CAPE Ratios. Technology stocks might exhibit higher ratios due to growth expectations, while utilities may have lower CAPE Ratios reflecting stable and predictable earnings.
While the CAPE Ratio is a valuable tool, it may not be equally applicable to all markets, especially emerging markets where historical earnings data might be less reliable.
Accurately adjusting for inflation is crucial for maintaining the integrity of the CAPE Ratio. Incorrect adjustments can result in misleading interpretations of stock valuations.