Some Leaders Can Be Replaced, Some Cannot, and Some Never Mattered
Jared Diamond's Hamlet test asks whether anyone else alive at the time could have done the same thing.

Passion Struck with John R. Miles · You Are Not the Only Variable: When to Change Yourself and When to Change Your Environment | John R. Miles - EP 816Jared Diamond, who won a Pulitzer Prize for his writing on geography and history, takes up leadership in his newest book, Prophets, Profits, Coaches & Kings. The subtitle states his question: when do leaders matter. Diamond argues that leaders fall into three types, the uniquely qualified who alone could have done what they did, the talented but replaceable, and those who made little difference at all.
His way of sorting them, which he calls the Hamlet test, asks whether anyone else alive at that time, given the same chances, could have produced the same result.
Diamond argues that the truth lies between two easy stories. One story says history is driven by exceptional individuals imposing their will on events. The other says individuals hardly count because conditions decide what happens. He argues that each case must be judged on its own.
He tests the idea with President Harry Truman, who took office after the death of Franklin Roosevelt without the usual preparation for the job. Diamond says 95 of the 96 sitting senators at the time could have handled the presidency as well as Truman did, and most of them had longer and more distinguished records.
He reaches the opposite conclusion with William Shakespeare, the English playwright. Writing Hamlet required steady work with a playing company, years of stage experience, and major plays already completed, including Romeo and Juliet and Julius Caesar. Historians can name about 20 other playwrights working in England in those years, and Diamond says some wrote good plays but none wrote anything close to Hamlet.
Questions people ask
Why is it called the Hamlet test?
It is named for Shakespeare's Hamlet, the play Diamond uses as his clearest case of an irreplaceable work. If another writer at the time could have produced it, the leader fails the test, and if not, the leader passes. Truman fails it, Shakespeare passes it.
What else is Jared Diamond known for?
Diamond is best known for Guns, Germs, and Steel, which won the Pulitzer Prize for General Nonfiction in 1998, and for Collapse. Both books argue that geography, resources, and environment shape what societies can do. The leadership book extends that long interest in how much individuals shape events.
How did Truman become president with so little preparation?
Truman had been a senator from Missouri and then vice president for only 82 days before Roosevelt died in April 1945. He had little involvement in wartime planning and had not been briefed on the atomic bomb. That abrupt succession is why Diamond treats him as a test of whether the office, rather than the man, did most of the work.