How does the equity risk premium change with the macro regime?

The ERP is regime-conditional. In Goldilocks (above-trend growth, low inflation), the ERP compresses as investors are willing to accept lower compensation for equity risk — driving valuations higher. In Stagflation (below-trend growth, rising inflation), the ERP expands as investors demand higher compensation for the dual risk of earnings compression and rising discount rates — driving valuations lower. The ERP is also sensitive to liquidity conditions: abundant liquidity compresses the ERP; liquidity contraction expands it.

LEARN · RISK PREMIUM & FACTOR INVESTING

What Is the Equity Risk Premium and How Does It Change with the Macro Regime?

Q: What is the equity risk premium?

The equity risk premium (ERP) is the excess return that equity investors expect to earn above the risk-free rate (typically the 10-year Treasury yield) to compensate for the higher risk of holding equities. The ERP is not directly observable — it must be estimated from current market prices, earnings expectations, and the risk-free rate. Common estimation approaches include the Gordon Growth Model (dividend yield + expected growth - risk-free rate) and the earnings yield spread (E/P ratio minus 10-year Treasury yield).

The equity risk premium (ERP) is the excess return equity investors expect above the risk-free rate for bearing equity risk. It compresses in Goldilocks (investors accept lower compensation, driving valuations higher) and expands in Stagflation (investors demand higher compensation for dual earnings and discount rate risk). The ERP is not directly observable — it must be estimated from market prices, earnings expectations, and the risk-free rate.

AhaSignals Research · Not investment advice

Ex-Ante vs Ex-Post: A Critical Distinction

The equity risk premium exists in two fundamentally different forms that are often conflated. The ex-ante (forward-looking) ERP is the expected excess return that investors demand today for bearing equity risk — it is estimated from current market prices and earnings expectations. The ex-post (backward-looking) ERP is the realized excess return that equities actually delivered over a historical period.

These two measures can diverge dramatically. The long-run ex-post ERP for US equities is approximately 4–6% (depending on the measurement period and methodology), but the ex-ante ERP varies with the macro regime: it compresses to near zero or negative in late-cycle Goldilocks regimes (when valuations are stretched) and expands to 6–8%+ during Contraction regimes (when valuations are depressed). When analysts cite "the" equity risk premium, it is essential to clarify which version they mean — using the ex-post average as a forecast for future returns is a common and costly error.

Estimating the ERP

The most widely used ERP estimate is the earnings yield spread: the S&P 500 earnings yield (E/P ratio) minus the 10-year Treasury yield. When this spread is wide, equities are cheap relative to bonds; when it is narrow or negative, equities are expensive. A negative earnings yield spread (equities yielding less than bonds) historically signals elevated valuation risk.

The ERP estimate is sensitive to earnings forecasts — using trailing earnings vs forward earnings produces different estimates. AhaSignals uses a blend of trailing and forward earnings to reduce sensitivity to any single estimate.

Confidence level: Conceptually plausible — ERP estimation is inherently uncertain. Not investment advice.

Known Limitations

ERP estimates have wide confidence intervals — different methodologies produce significantly different values
The ERP can remain compressed for extended periods in Goldilocks regimes — it is not a reliable short-term timing signal
Not investment advice.