Positive Stock-Bond Covariance and the Breakdown of Duration Hedging: Factor Attribution and Defensive Re-Weighting Under 5.2% Yields
With 10-year Treasury yields reaching 5.20% and stock-bond correlation flipping to +0.48, traditional duration hedging has inverted into a risk amplifier. We model the mathematical breakdown of 60/40 and Risk Parity, conduct multi-factor attribution, and re-engineer true defensive factor allocations.