Is This 1950s Investing Strategy Holding Your 2026 Portfolio Back?

The diversification-focused modern portfolio theory has been the investing "rulebook" for decades, but it might be worth considering whether it fits your goals.

# Is This 1950s Investing Strategy Holding Your 2026 Portfolio Back? The diversification-focused modern portfolio theory has been the investing "rulebook" for decades, but it might be worth considering whether it fits your goals. **Read the full article:** [Kiplinger](https://www.kiplinger.com/investing/is-this-old-fashioned-investing-strategy-holding-your-portfolio-back) *This article was originally published by Kiplinger. MoneyWiseInc provides expert curation of the best financial content from trusted sources.*