Equity Risk Premium
Definition
The Equity Risk Premium (ERP) is the excess return that investing in stocks is expected to provide over a "risk-free" asset, typically short-term U.S. Treasury bills. It reflects the compensation investors demand for taking on the higher risk of owning equities instead of safer fixed-income instruments.
Mathematically: ERP = Expected Stock Return – Risk-Free Rate
Why It Matters to Investors
- Central to asset allocation decisions in long-term investing
- Affects how equities are valued relative to bonds or cash
- Used in models like the Capital Asset Pricing Model (CAPM)
- Helps investors understand why stocks are expected to outperform bonds over time
- Influences expectations for future returns, especially in retirement and pension planning
The TiltFolio View
The Equity Risk Premium underpins many traditional strategies that maintain permanent stock exposure. However, TiltFolio's approach is different. TiltFolio Adaptive doesn't rely on long-term averages or historical assumptions. Instead, it actively assesses whether equity markets are in a strong trend, and only allocates when they are. TiltFolio Balanced maintains consistent equity exposure (30% SPY) as part of its diversified allocation.
By avoiding equities during sustained downtrends, TiltFolio Adaptive aims to sidestep periods when the ERP turns negative or offers poor compensation for risk. TiltFolio Balanced relies on diversification to manage equity risk across different market conditions. In this sense, while both systems acknowledge the theoretical value of the ERP, TiltFolio Adaptive believes its practical benefits are highly conditional and best captured dynamically through trend-following.
Real-World Application
• A financial planner uses a 4–5% ERP assumption in retirement projections
• An investor shifts from stocks to bonds when they believe ERP is unusually low
• An equity valuation model adjusts expected returns based on current risk-free rates