Berkshire Hathaway Vice Chair Charlie Munger once shared how a simple childhood marble game helped shape the disciplined, high-conviction investing strategy that defined his decades-long success.

In a November 2023 interview with CNBC’s Becky Quick, Munger, who died shortly after this interview, reflected on how his early experiences playing marbles—specifically prized “agates”—influenced his approach to risk and decision-making.

“As a little boy, I carried more money than all the other little boys,” Munger said, recalling how he treated the game seriously.

“I never wanted to lose my good, valuable collection, you know, if some guy was more coordinated than I was at shooting marbles. So I would never play for…