LEARN · RISK PREMIUM & FACTOR INVESTING
What Is Risk Premium Decomposition and Why Does It Matter?
Total return = risk-free rate + risk premium + unexpected return. Risk premium decomposition reveals whether strong returns were driven by a high risk premium (sustainable — the premium will continue to be harvested) or by risk premium compression (potentially unsustainable — the premium has been pulled forward and future returns will be lower). Decomposition is essential for assessing whether current valuations are justified by fundamentals or by liquidity-driven compression.
AhaSignals Research · Not investment advice
The Decomposition Framework
A simple decomposition of equity total return: Total Return = Dividend Yield + Earnings Growth + Change in Valuation Multiple. The first two components are fundamental — they reflect the actual cash flows generated by the business. The third component (change in valuation multiple) reflects changes in the equity risk premium: when the ERP compresses, multiples expand and total return is boosted; when the ERP expands, multiples contract and total return is reduced.
Over long periods, the valuation multiple change component averages near zero — it cannot persistently contribute to returns. This means long-run equity returns are primarily determined by dividend yield and earnings growth, not by multiple expansion. Periods of strong multiple expansion (like 2010–2021) are typically followed by periods of multiple contraction.
Confidence level: Well-supported — the decomposition framework is standard in equity valuation. Not investment advice.
Known Limitations
- The timing of multiple mean-reversion is unpredictable — multiples can remain elevated for decades
- Structural changes (e.g., lower risk-free rates permanently) can justify permanently higher multiples
- Not investment advice.