This week, the focus is on diversification—and why it’s getting harder to achieve. Portfolio Strategist Natalie Gill explains how the “diversification mirage,” a key theme in BII’s 2026 outlook, is now showing up in real time. A small set of megaforces is increasingly dictating equity performance, meaning traditional attempts to diversify—whether toward equal-weighted indices or new regions—can amount to larger active positions than many investors realize.

Natalie also breaks down how rising developed-market bond yields challenge the long-held assumption that long-term bonds reliably balance portfolios. Fiscal strains, shifting central bank stances, and policy divergence between the U.S. and other economies further complicate the diversification picture. As bond volatility rises and a small number of equity drivers dominate returns, investors may need to reconsider how and where true diversification can be found.

The episode also highlights the growing disconnect between the Federal Reserve’s policy posture and the more hawkish tone across Australia, Canada, and Japan—where fiscal dynamics and reopening risks are influencing long-term rates. These divergences, paired with delayed U.S. labor data and inflation considerations, shape the macro backdrop as markets enter the new year.

Key Insights

· Diversification is increasingly difficult as a handful of megaforces drive global equity performance.

· Traditional diversifiers—such as long-term government bonds—provide less balance amid rising yields.

· Policy divergence between the U.S. and other major central banks is creating new cross-market risks.

· Fiscal concerns are influencing yield curves, particularly in Japan and the UK.

· Portfolios may require more deliberate, active decisions and alternative sources of return to achieve true diversification.

diversification, megaforces, capital markets, macro trends, bond yields, portfolio balance, market outlook

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244: Market take: The Diversification Mirage in Plain Sight

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