Meir Statman, Ph.D.

The Magnificent Seven, Diversification and Long-Term Success

Diversification vs. Concentration in the Era of the ‘Magnificent Seven’

At the end of 2022, “The Magnificent Seven” was no more than the title of a 1960 American Western starring Yul Brynner and Steve McQueen. By the end of 2023, however, the “Magnificent Seven” turned into the name of a group of seven stocks that contributed more than two-thirds of the S&P 500® Index’s return […]

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behavioral portfolio theory

The Unheralded Contributions of Markowitz to Behavioral Portfolio Theory

“I split my contributions 50/50 between bonds and equities,” Harry Markowitz said in a famous 1998 interview with Jason Zweig.1 Markowitz readily admitted that he did not compute co-variances and draw a mean-variance efficient frontier. “Instead, I visualized my grief if the stock market went way up, and I wasn’t in it —or if it

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