The traditional 60-40 stock-and-bond portfolio has long been financial advisers' standard recommendation for balancing risk and stability. Robert C. Pozen, a veteran money manager with over two decades of experience, argues this conventional wisdom may actually harm many investors' long-term returns. His analysis suggests equity allocations should be substantially higher for certain demographics.

Pozen identifies two distinct groups that should reconsider heavy bond positions. Retirees dependent on investment income and investors who might need to liquidate assets during market downturns legitimately require significant fixed-income exposure. However, these investors represent a minority of the broader population with substantial assets.

The author specifically targets six to seven million Americans with $1 million or more in investable assets, along with households holding $100,000-plus where non-investment income covers living expenses. For these investors, Pozen recommends a 90/10 stock-to-bond allocation rather than the traditional 60/40 split. This dramatic shift acknowledges that wealthy investors can weather volatility while benefiting from equities' superior long-term growth potential.

The practical implication is clear: investors with stable non-investment income streams should prioritize equity exposure over bond safety. Those who don't need regular portfolio withdrawals can afford to let stocks drive their wealth accumulation strategy.