Why Not 100% Equities

A recent wave of research arguing that long-term investors should be 100% in equities has reignited an old debate, but the core claim largely restates a basic truth: assets with higher expected returns tend to deliver higher average realized returns over time. The more important question for advisors and investors is not which asset has the highest standalone return, but which diversified portfolio offers the best balance of return per unit of risk, and how to adjust overall risk using tools like leverage or cash rather than abandoning diversification. Relying on a sample period boosted by rising valuations and a dominant U.S. market risks overstating future equity returns and underestimating concentration risk.

Claims that Americans are leaving “trillions” on the table by not going all-in on equities ignore market equilibrium: every extra buyer must meet a seller, so aggregate wealth cannot magically rise just because everyone prefers stocks at once. For both traditional assets and liquid alternatives, the real opportunity lies in building resilient portfolios that improve risk-adjusted returns—even if they occasionally look unconventional—rather than simply chasing whatever has gone up the most in backtests.