Earnings Yield Gap

The difference between the earnings yield of a stock market index and the yield on a risk-free government bond.

The earnings yield gap is a valuation metric used to compare the relative attractiveness of equities versus fixed-income securities. It is calculated by subtracting the risk-free rate (typically the yield on a 10-year government bond) from the earnings yield of a stock market index, which is the inverse of the price-to-earnings (P/E) ratio. By comparing the yield generated by corporate earnings to the guaranteed yield of government debt, the metric helps investors assess whether they are being adequately compensated for taking on the higher volatility and risk of the stock market. This gap serves as a practical proxy for the equity risk premium. A wide, positive gap suggests that equities are undervalued or highly attractive relative to bonds, which may prompt asset allocators to shift capital into stocks. Conversely, a narrow or negative gap indicates that stocks are expensive relative to bonds, signaling that the potential return on equities may not justify their risk. A common pitfall is relying on trailing earnings during economic transitions, as a sudden drop in corporate profits can quickly shrink the actual yield gap.

If the S&P 500 trades at a P/E ratio of 20, its earnings yield is 1 / 20 = 5.0%. If the 10-year Treasury bond yield is currently 3.5%, the earnings yield gap is 5.0% - 3.5% = 1.5%. This positive gap of 150 basis points indicates that equities offer a yield premium over risk-free government debt.