Rethinking fixed income asset allocation A systematic approach

The post-pandemic inflation regime has weakened the diversification role of government bonds, requiring fixed-income allocation to combine structural tilts with dynamic timing.

• For more than 20 years, stocks and bonds usually moved in opposite directions, but the relationship turned positive in 2021 and both asset classes suffered sharp losses in 2022 during the fastest and most aggressive monetary tightening since the Volcker shock.
• BlackRock's rolling 252-day analysis shows average daily stock-bond correlation of approximately +30% between 1970 and 2000 versus -26% since 2000; in 2022, the correlation became strongly positive.
• Before 2000, consumption and inflation were negatively correlated by about 30%, while after 2000 the correlation averaged around +15%; the post-COVID period points back toward rising inflation damaging both consumption and asset prices.
• The historical risk-parity framework benefited from negative stock-bond correlation after the Global Financial Crisis, whereas the mid-1960s to late 1990s were characterized by positive correlation and risky and safe assets moving together.
• The proposed framework combines inverse-volatility weighting, trend following based on smoothed recent returns, and volatility-adjusted carry with timing; trend following can help in prolonged downturns but is vulnerable to sharp reversals such as March 2020.

Takeaway: Investors should not assume that Treasuries will reliably hedge equity risk; combining long-term allocation tilts with timing may improve resilience across inflationary, recessionary and crisis regimes, although each component has identifiable failure modes.