Max Planck
Subject of Munger's 'Chauffeur Knowledge' parable on genuine vs. superficial understanding
Biography
Max Planck (1858–1947) was the German theoretical physicist whose discovery of the quantum of action — Planck's constant — opened the quantum era in physics and won him the 1918 Nobel Prize. He was by temperament a conservative scientist, reluctant to accept the radical implications of his own discovery, yet he became the elder statesman of German science and the namesake of its great research society.
Planck also made a famous observation about how science actually advances. New truths, he argued, do not triumph by convincing their opponents; they triumph because their opponents eventually die and a new generation grows up familiar with them. The quip — sometimes paraphrased as "science advances one funeral at a time" — is one of the most cited propositions in the sociology of knowledge, and Munger found in it a deep confirmation of his own psychology of misjudgment: even the ablest minds, sworn to follow evidence, cannot unlearn what made them famous.
Planck's third role in the Munger corpus is as the protagonist of a story Munger told constantly: the apocryphal tale of Planck's chauffeur, which became Munger's sharpest instrument for separating genuine knowledge from its imitation.
Key Stories
Planck knowledge versus chauffeur knowledge. The story, as Munger told it at the 2007 USC Law commencement, runs like this: after winning the Nobel Prize, Planck lectured across Germany on quantum mechanics with his chauffeur in attendance. The chauffeur, having memorized the lecture, proposed switching places; Planck agreed. After the chauffeur delivered the lecture flawlessly in Munich, a physics professor asked a ghastly question — and the chauffeur replied, "Well, I'm surprised that in an advanced city like Munich I get such an elementary question, I'm going to ask my chauffeur to reply." The wit gets the laugh; the point gets the work. "In this world we have two kinds of knowledge," Munger explained. "One is Planck knowledge, the people who really know, they paid the dues they have the aptitude. Then we got chauffeur knowledge, they have learned to prattle the talk." The test that separates them is the unscripted question.
Planck's funerals. In the 1995 Psychology of Human Misjudgment, Munger deployed Planck's observation about scientific revolutions as evidence that brain-blocking is universal, not merely a failure of soft minds: "Planck is famous not only for his science but also for saying that even in physics the radically new ideas are seldom really accepted by the old guard. Instead, said Planck, the progress is made by a new generation that comes along, less brain-blocked by its previous conclusions." Even Einstein, Munger noted, never fully accepted quantum mechanics in his later years — the discoverer's own brain-block, exactly on Planck's schedule. Munger returned to the point in the 1988 Wesco letter: correct new ideas had to wait for "new professors who had less to unlearn."
Why Planck abandoned economics. At UCSB in 2003, Munger offered Planck's verdict on economics as a humility check for everyone in the room: "Now why did Max Planck, one of the smartest people who ever lived, give up economics? The answer is, he said, 'It's too hard.'" The best solution economics offered was messy and uncertain, which could not satisfy a mind formed by physics. Munger's conclusion: if Planck concluded perfect order was unattainable, the rest of us should expect the same — and build investment systems that don't require it.
Impact on Munger's Work
The chauffeur story supplies Munger's operational test for genuine understanding — what the knowledge base calls chauffeur knowledge. Credentials, fluency, and confident delivery are all chauffeur-compatible; only the ability to answer questions you haven't prepared for marks Planck knowledge. Munger applied the distinction ruthlessly in evaluating managers, advisors, and experts: the financial world is densely populated with chauffeurs who have learned to prattle the talk, and the investor's job is to keep responsibility with the people who really know.
Planck's funeral-march sociology of science became a load-bearing piece of Munger's psychology. It explained why bad ideas persist in institutions long after their refutation — the old guard does not convert, it retires — and therefore why the inconsistency-avoidance tendency must be treated as a permanent feature of even elite cognition. It also gave Munger his characteristic patience with institutional change: you rarely fix the incumbents; you wait for the generation with less to unlearn.
Finally, Planck's retreat from economics functioned in Munger's thought as a calibration device for epistemic ambition. If the discoverer of Planck's constant found economics too hard to reduce to order, then economists claiming precise foresight, and investors demanding false precision from valuation, are engaged in chauffeur knowledge themselves. The lesson Munger drew was to build for messiness: margin of safety, simple businesses, and decisions that remain right even when the future refuses to be orderly.
Key Passages From Munger's Speeches and Letters
"In this world we have two kinds of knowledge, one is Planck knowledge, the people who really know, they paid the dues they have the aptitude. Then we got chauffeur knowledge, they have learned to prattle the talk."
"Now why did Max Planck, one of the smartest people who ever lived, give up economics? The answer is, he said, 'It's too hard.'"
"Planck is famous not only for his science but also for saying that even in physics the radically new ideas are seldom really accepted by the old guard. Instead, said Planck, the progress is made by a new generation that comes along, less brain-blocked by its previous conclusions."
"Max Planck, the Nobel laureate, noted that even in physics, wherein the ablest of mankind are sworn as their highest duty to improve ideas to fit facts, you never really changed the minds of most of the old professors. Instead, the wide acceptance of correct new ideas had to wait for new professors who had less to unlearn."
Referenced In
Source: Charlie Munger Knowledge Base — Munger speeches, Wesco Financial annual letters, DJCO annual meeting transcripts