Harry Markowitz (1927–2023)

Who They Were

Harry Markowitz (1927-2023) was an American economist widely regarded as a founder of modern portfolio theory and of the field of financial economics. Working from the 1950s onward, he brought mathematical rigour to the question of how investors should combine assets when returns are uncertain. His research provided a formal framework for thinking about the trade-off between risk and reward in building an investment portfolio, an approach that became central to both academic finance and professional practice. In 1990 he shared the Sveriges Riksbank Prize in Economic Sciences with Merton Miller and William Sharpe for their pioneering work in the theory of financial economics. His ideas remain a standard part of how investors and scholars understand diversification and risk.

Key Contributions

Markowitz is best known for modern portfolio theory, which analyses how an investor can combine assets to manage the trade-off between expected return and risk. His key insight was that the risk of a portfolio depends not just on the individual assets but on how their returns move together, so that diversification can reduce risk without necessarily sacrificing return. This gave a precise, mathematical foundation to the intuition that investors should not put everything into a single asset. His 1990 Nobel, shared with Merton Miller and William Sharpe, recognised this pioneering work in the theory of financial economics. Because detailed dates of his specific publications are not provided here, this entry keeps to the well-established substance of his contribution: the formal analysis of portfolio choice under uncertainty.

On EconRecall

American economist and founder of modern portfolio theory, who shared the 1990 Nobel in financial economics. Play the games that feature Harry Markowitz:

• Nobel Laureate Timeline