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Specialists start faster and plateau sooner
Fast start, early plateau
Society and capitalism have pushed people to specialize earlier and earlier, in sports and in nearly every field, and the early payoff is real. A specialist gets immediate gratification and comes out of the gate quickly. A generalist's gratification comes later, in almost every scenario. The book's examples include great athletes who did not start in their eventual sport and were better for having played others.
Curiosity in practice
Investing may be the perfect case, since it needs so many disciplines, though the book gives no investing example. Curiosity feeds it, and curiosity is not raw IQ: a person who is really curious ends up with lots of interests. At 19 or 20, Todd Combs took astronomy courses and sat in the planetarium at midnight on a Friday, thought about becoming an architect and took architecture classes, and was not good at any of it.
The limits of breadth
Breadth has a limit when it is time to act. Being curious about astronomy does not mean knowing what to do about it, so it matters to recognize whether you are in a learning phase or an action phase and to stay inside your circle of competence. Time horizon matters too: someone trying to be number one in three years probably cannot afford range, while someone with 20 or 30 years may see unconnected things come together.
Why do athletes sample many sports first?
Sport scientist Jean Côté studied how elite athletes developed and described a pathway he called the sampling years. In it, children play several sports for fun, then narrow to one in their teens. Many top athletes followed this path rather than training in a single sport from early childhood. Côté's work at Queen's University in Canada has been widely cited in youth sports guidelines.
Where did Buffett's circle of competence idea come from?
Warren Buffett used the phrase in Berkshire Hathaway's shareholder letters to describe the set of businesses an investor can evaluate. He wrote that the size of the circle matters far less than knowing where its edge lies. Charlie Munger often repeated the idea in his talks.
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