Equity Risk Premium (ERP) Oscillator

Overview

This pillar measures the excess return investors demand for holding stocks over risk-free government bonds. It provides a core valuation signal, indicating if the market is cheap or expensive on a relative basis.

What It Does

The ERP Oscillator calculates the spread between the S&P 500's earnings yield and the 10-year Treasury yield. It then normalizes this spread against its historical range to create an oscillator. This tool helps identify when the market is overly fearful, demanding a high premium, or overly complacent.

Why It Matters

It provides a fundamental valuation anchor in a market often driven by short-term sentiment. A high ERP suggests a potential cushion for stocks and a bullish long-term outlook, while a low ERP signals increased risk and a more bearish stance.

How It Works

First, the pillar pulls the current earnings yield for the S&P 500 and the yield on the 10-year U.S. Treasury bond. It then subtracts the bond yield from the stock earnings yield to get the raw ERP. Finally, this value is compared to its historical average and standard deviation to plot its position as an oscillator.

Methodology

Calculated as: (S&P 500 Trailing 12-Month Earnings / S&P 500 Price) - 10-Year U.S. Treasury Yield. The resulting value is then converted into a Z-score based on a 10-year rolling lookback period, where values above +1.5 are considered high and below -1.5 are considered low.

Edge & Advantage

This pillar cuts through short-term market noise by focusing on the fundamental relationship between earnings and interest rates, often revealing major market turning points before they become obvious.

Key Indicators

• S&P 500 Earnings Yield

  high

  The inverse of the P/E ratio, representing the earnings return on the stock index.

• 10-Year Treasury Yield

  high

  The 'risk-free' rate of return, serving as the benchmark for comparison.

• ERP Z-Score

  medium

  The current ERP's deviation from its long-term average, indicating if the market is cheap or expensive relative to its own history.

Data Sources

• U.S. Department of the Treasury

  Provides daily yield curve rates for U.S. Treasury securities.

• S&P Dow Jones Indices

  Provides S&P 500 index level, P/E ratio, and earnings data.

• Federal Reserve Economic Data (FRED)

  A comprehensive database for economic data including Treasury yields and corporate bond spreads.

Example Questions This Pillar Answers

• → Will the S&P 500 close above 5,500 by the end of the year?
• → Will the Equity Risk Premium be higher on December 31st than it is today?
• → Will stocks outperform bonds over the next 12 months?

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