Did you ever wonder whether the person sitting in the Oval Office actually changes your life, or whether you’d be living in basically the same world if someone else had won the election?
That question has haunted me since I first started paying attention to politics. And it’s exactly the question Jared Diamond, the Pulitzer Prize-winning author of Guns, Germs, and Steel, tackles in his latest book, Profits, Prophets, Coaches, and Kings: (When) Do Leaders Matter? .
Overview
In Profits, Prophets, Coaches, and Kings, Diamond argues that the question “Do leaders matter?” is too simple. The real question is “When do leaders matter?”. He examines this across four spheres, politics, business, sports, and religion, using two methods: detailed biographies and what he calls “natural experiments” (statistical comparisons of real-world events that resemble controlled experiments).
The book’s main insight? Leaders matter most when they have lots of discretion, freedom to make choices unconstrained by rules, traditions, or powerful rivals. A dictator matters more than a democratic prime minister. A CEO of a perfume company matters more than a CEO of a public utility.
A founding president of a new nation matters more than a fifth-term prime minister.
But here’s the thing: Diamond also argues that many famous leaders, people like Bill Gates, Steve Jobs, and Jeff Bezos, probably don’t pass his “Hamlet test” (meaning someone else could have done roughly what they did). The leaders who truly changed everything were often obscure figures in exactly the right place at exactly the right time.
Reader recommendation: If you love big-picture thinking, cross-disciplinary comparisons, and having your assumptions challenged, you’ll probably enjoy this book. If you prefer deep dives into single subjects or hate statistical analysis, you might find it frustrating. It’s written for general readers, not academics, Diamond’s gift is making complex ideas accessible.
But be warned: some reviewers have called it “flawed” and “unconvincing” while still admitting it’s “fascinating”.
Table of Contents
1. Introduction
Book: Profits, Prophets, Coaches, and Kings: (When) Do Leaders Matter?
Author: Jared Diamond
Publication Date: September 1, 2026
Publisher: Mariner Books (HarperCollins)
Jared Diamond needs little introduction. He’s a professor of geography at UCLA, a MacArthur Fellow (“genius grant” recipient), and the winner of the Pulitzer Prize for General Nonfiction for Guns, Germs, and Steel (1997). That book has sold more than seven million copies and fundamentally changed how many people think about why some societies prospered while others didn’t. He’s also written Collapse, The Third Chimpanzee, The World Until Yesterday, and Upheaval.
What makes Diamond unusual is his background. He started as a physiologist, he has a PhD from Cambridge and spent years studying the gallbladder and other bodily functions before pivoting to geography, history, and anthropology. That scientific training shows up everywhere in his writing. He thinks like a scientist: he looks for patterns, tests hypotheses, and wants evidence, not just stories.
Context: What This Book Is About
Profits, Prophets, Coaches, and Kings is a study of leadership across four domains: politics (presidents, prime ministers, dictators), business (CEOs and founders like Bezos and Gates), sports (coaches like UCLA’s John Wooden), and religion (founders like Joseph Smith and Jesus).
Diamond’s central question is simple but profound: do individual leaders actually change the course of history, or are they just figureheads swept along by larger forces?
Purpose: The Book’s Central Thesis
Diamond rejects both extremes. He doesn’t buy Thomas Carlyle’s Great Man theory, the idea that history is “just the biography of great men”. But he also doesn’t buy Leo Tolstoy’s view in War and Peace that leaders are “history’s slaves” who have no real influence.
Instead, Diamond argues for a middle ground: leaders sometimes matter a lot, sometimes matter a little, and sometimes don’t matter at all. The key is understanding when and why.
To figure this out, he uses two methods:
- Biographies of specific leaders, looking for unique qualities that no one else possessed.
- Natural experiments, statistical comparisons of what happens when leaders die, get assassinated, get fired, or get sick, compared to when they don’t.
2. Background
Why does this question even matter? Diamond gives several reasons in the book’s Prologue.
First, it’s personal for him. Diamond was born in 1937 into a Jewish family with roots in Eastern Europe. Many of his relatives didn’t escape Hitler’s armies. Some died in Auschwitz. Others survived but were traumatized for life. So he’s spent his whole life wondering: would the Holocaust have happened without Hitler? Was Hitler uniquely evil, or was he just a product of German history?
Second, it’s practical. Every time we vote, we’re implicitly answering the question “do leaders matter?” If they don’t, why bother voting? If they do, whom should we vote for? Similarly, company boards have to decide whether to pay CEOs enormous salaries. If CEOs are interchangeable, paying someone $100 million is insane.
If they’re unique, maybe it makes sense.
Third, it’s intellectually fascinating.
Diamond points to Genghis Khan as an example. Genghis was undoubtedly a military genius, he built the largest land empire in history. But tree-ring data recently showed that his rise coincided with the wettest period on the Mongolian steppe in 2,000 years. More rain meant more grass, more horses, more soldiers, more babies.
Would Genghis have succeeded if he’d been born 20 years earlier or 200 miles south? Probably not. So was his success due to him or to the weather?
3. Profits, Prophets, Coaches, and Kings Summary
Let me walk you through what I learned from this book. I want to give you enough detail that you’ll understand the key arguments even if you never pick up the book yourself.
Part 1: Political Leaders
Diamond starts with two biographical case studies of political leaders who, he argues, clearly made a difference.
Seretse Khama: The Founder Who Mattered
The first is Seretse Khama, the founding president of Botswana. When Botswana became independent from Britain in 1966, it was the third-poorest country in the world. It had only seven miles of paved road, 22 university graduates, and two secondary schools. It was landlocked, mostly desert, and surrounded by white-minority-ruled countries including apartheid South Africa.
What changed? Two things.
First, diamonds were discovered in Botswana in 1967, the year after independence. Normally, this would be a curse, diamonds and oil usually cause corruption, civil wars, and secession movements (think Sierra Leone, Angola, Nigeria). But Khama handled it differently.
Second, and this is where Khama’s unique position matters, the diamonds were discovered on land belonging to his own tribe, the Bangwato. As the hereditary chief of that tribe, only he had the authority to give up the tribe’s rights to the diamonds. And he did exactly that. He signed away his own tribe’s mineral rights to the national government. Other chiefs felt compelled to follow suit.
Diamond argues that no other leader could have done this. If the chief of a different tribe had tried to take the Bangwato’s diamonds, it would have provoked a civil war. But Khama, as the most powerful chief, could get away with it.
Khama also made other crucial decisions:
- He invested diamond revenues in a long-term investment fund rather than spending them immediately.
- He kept experienced expatriate civil servants rather than replacing them immediately with inexperienced locals.
- He gutted the power of traditional chiefs, making them merely advisory.
- He walked a tightrope with apartheid South Africa, supporting Black independence movements quietly while avoiding invasion.
The result? Botswana became Africa’s fastest-growing economy, its best-governed country, and one of its richest. Diamond calls Khama a leader who clearly passed the “Hamlet test”, no one else could have done what he did.
Rachel Carson: The Writer Who Changed the World
The second case study is Rachel Carson, author of Silent Spring. Carson wasn’t a politician. She never held office. She was a scientist working for the US Fish and Wildlife Service.
But her 1962 book Silent Spring exposed the dangers of pesticides like DDT. It led to congressional hearings, the banning of DDT, and the creation of the Environmental Protection Agency in 1970.
Why was Carson uniquely qualified? Diamond gives several reasons:
- She was a trained scientist who could understand complex technical issues.
- She was a beautiful writer, her prose was lyrical and poetic, unlike anything other scientists were producing.
- She wasn’t a university professor, so she didn’t face the academic pressure to write in impenetrable jargon.
- She had the freedom to write full-time because her earlier books had made enough money.
Diamond argues that Carson, like Khama, passes the Hamlet test. No one else could have written Silent Spring with the same impact.
The “Usual Suspects”
Diamond then lists 22 better-known political leaders, people like Churchill, de Gaulle, Mandela, Thatcher, and Hitler, and asks whether they made a difference.
He draws several conclusions:
- Founding leaders matter most. Khama, Lee Kuan Yew (Singapore), and Nehru (India) established institutions that persisted long after they left office.
- Leaders with more power have more impact. Dictators matter more than democratic leaders. Wartime leaders matter more than peacetime leaders.
- Timing is everything. Churchill was a disastrous peacetime Chancellor of the Exchequer but a brilliant wartime Prime Minister. He knew it too, he wrote that becoming Prime Minister in May 1940 felt like “walking with Destiny”.
- Impactful leaders face strong opposition. Most of the 22 leaders were imprisoned, exiled, or removed from power against their will.
But Diamond also points out a weakness of the biographical method: sometimes great leaders emerge from nowhere. Harry Truman had an undistinguished career before becoming president, he was the only 20th-century US president without a college degree. Adolf Hitler showed no signs of his later abilities until after his 30th birthday. If even their closest associates couldn’t predict their rise, how can we be sure no one else could have done what they did?
Part 2: Natural Experiments
This is where Diamond shifts from biography to statistics, and where the book gets really interesting.
The Minimum Wage Study
Diamond describes a famous natural experiment by economists David Card and Alan Krueger. In 1992, New Jersey raised its minimum wage to $5.05 per hour, while neighboring Pennsylvania kept its minimum wage at the federal level of $4.25.
Card and Krueger surveyed 410 fast-food restaurants on both sides of the border, before and after the change. Conventional economics predicted that employment would drop in New Jersey. Instead, employment increased.
Why? Possibly because restaurants raised prices slightly (by 3%) to cover the higher wages, and customers didn’t notice. Or because some restaurants were already profitable enough to absorb the cost.
This study changed how economists think about minimum wage laws. By 2000, most American economists had abandoned the view that raising the minimum wage increases unemployment.
The Diplomatic Parking Ticket Study
Another natural experiment involved diplomats at the United Nations in New York City. Diplomats have diplomatic immunity, which for years meant they couldn’t be punished for parking illegally.
Some diplomats racked up hundreds of parking tickets per year, almost one per day. Others had zero. The variation correlated strongly with corruption levels in their home countries, as measured by Transparency International.
In 2002, the US State Department finally allowed New York City to revoke the diplomatic license plates of cars with three or more unpaid tickets. Within a month, parking violations dropped by 98%.
The lesson: corruption reflects both social norms and law enforcement. Even diplomats from corrupt countries stopped breaking the rules when they knew they’d face consequences.
The Inbreeding Study
This was the most surprising natural experiment for me. Diamond describes a study by economists Sebastian Ottinger and Nico Voigtländer. They analyzed 336 European monarchs who reigned between AD 990 and 1795.
European royal families were highly inbred, they married relatives to keep power and territory within the family. Inbreeding reduces IQ. Children of first-cousin marriages have IQs about 27 points below average; children of uncle-niece marriages have IQs about 37 points below average.
The researchers calculated each monarch’s “inbreeding coefficient” and compared it to two outcomes: territorial expansion and urban population growth.
The results were clear: more inbreeding meant worse outcomes. For each standard deviation increase in mental ability (inferred from lower inbreeding), the monarch’s nation grew 16% more in territory and 13% more in urban population.
The effect was strongest in absolute monarchies like Prussia and Turkey, where the ruler had few constraints. It was weakest in constitutional monarchies like England after 1600, where parliaments limited the king’s power.
This is powerful evidence that leaders matter, at least, smarter leaders produce better outcomes.
Assassinations and Leader Deaths
Diamond also discusses studies by Benjamin Jones and Benjamin Olken on what happens when leaders die.
When leaders die of natural causes (heart attacks, cancer, accidents), the economy changes, but in unpredictable directions. Some successors are better, some are worse. On average, there’s no change. But the variance increases, meaning leaders do make a difference, just not consistently.
Assassinations are trickier because they’re not random, assassins target leaders because of their policies. But Jones and Olken compared successful assassinations to unsuccessful ones. The difference between success and failure is often random: a bullet misses, a grenade bounces off someone’s chest, a bomb goes off a moment too late.
Their finding: successful assassinations tend to hasten the end of wars but don’t affect the outbreak of new ones. The assassination of Archduke Franz Ferdinand triggered World War One, but Diamond argues that a world war would probably have broken out soon anyway because of Europe’s system of hostile alliances.
Ranking Leaders by Economic Growth
Finally, Diamond cites a study by William Easterly and Steven Pennings that ranked 646 national leaders from 1951 to 2014 by their effect on economic growth.
The top-ranked leader? Seretse Khama of Botswana. The second-ranked? Japan’s Ikeda Hayato, whose economic policies launched Japan’s decade of doubled incomes.
The bottom-ranked? Haiti’s Raoul Cedras, whose 1991 coup triggered international sanctions that devastated Haiti’s economy. Also near the bottom: Uganda’s Idi Amin, who killed hundreds of thousands and expelled all economically active Asians.
Surprisingly, the list includes some familiar names in the “negative” column: Britain’s Harold Wilson, America’s Richard Nixon, and Dwight Eisenhower. Not because they were bad leaders overall, but because their economies grew more slowly than those of their contemporaries.
Part 3: Business Leaders
Diamond then turns to business, starting with an unlikely case study: pomegranate juice.
The Pomegranate Juice Story
Before 2002, there was no bottled pomegranate juice in the world. Americans had barely heard of pomegranates.
Today, it’s a billion-dollar industry. How did that happen?
Enter Lynda and Stewart Resnick, a wealthy California couple who happened to own most of America’s pomegranate bushes. The Resnicks had the money, the motivation (they believed in the fruit’s health benefits), the marketing skills (Lynda designed the iconic double-bubble bottle), and the patience to fight legal battles against competitors selling fake “pomegranate juice” that was actually grape juice dyed red.
Diamond argues that the Resnicks were uniquely positioned to create the pomegranate juice industry. No one else had both the pomegranate supply and the money. It took them 14 years to turn a profit. This is another case where the Hamlet test works: we can identify everyone who had significant pomegranate acreage, and only the Resnicks had the resources and vision.
The Famous Founders: Bezos, Gates, Jobs, Musk, Zuckerberg
But what about the big names? Jeff Bezos, Bill Gates, Steve Jobs, Elon Musk, Mark Zuckerberg?
Diamond argues that none of them pass the Hamlet test. Other people were working on e-commerce, personal computers, smartphones, social media, and electric cars at the same time.
Take Bezos. He didn’t invent online selling. There were already online bookstores before Amazon. Barnes & Noble launched its own online bookstore in 1996. Walmart set up its own online business in 2000.
What Bezos did was make different choices:
- He prioritized customer satisfaction over short-term profits, easy returns, fast delivery, customer reviews.
- He was relentless, driving employees to meet seemingly impossible standards.
- He had a long-term vision of an “everything store” and executed it step by step.
- He expanded into new ventures, Kindle, AWS, Prime Video, Whole Foods.
Similarly, Gates, Jobs, Musk, and Zuckerberg made distinctive choices that shaped their industries. Without them, we’d still have personal computers, smartphones, social media, and electric cars, but they’d look different.
Diamond’s conclusion: these leaders did make a difference, but not in the way Khama or the Resnicks did. They didn’t create entirely new categories. They shaped existing categories through their choices.
What Happens When the CEO Dies?
Diamond then discusses natural experiments on CEOs, using Danish data. Denmark maintains exhaustive records on every company and every citizen, making it a goldmine for researchers.
One study found that when a CEO dies, company profits drop by an average of 13% within two years. When a board member dies, there’s no effect.
When a CEO’s close relative dies, especially a child or spouse, profits also drop. The effect is bigger for female CEOs than male CEOs (28% vs 8%).
When a CEO is hospitalized for 10 or more days, profits drop by 4%.
These effects are bigger in high-growth industries than low-growth ones. That’s because CEOs in high-growth industries have more discretion, more freedom to make choices that matter.
Diamond then asks: how much of a company’s performance is due to the CEO versus other factors?
Statistical analyses (ANOVA) suggest that CEOs account for 6% to 29% of variation in company earnings. The company itself accounts for more (often 20-40%), and the industry accounts for a significant amount too.
But the key factor is discretion. CEOs matter most in industries where they have the most freedom to make choices: computers, soaps and perfumes, movies, games, toys, fashion. They matter least in industries where choices are constrained: shipbuilding, public utilities, steel mills, railways.
As Diamond puts it: if you want to be a famous, influential CEO, don’t run a blast furnace. Run a perfume company.
Part 4: Sports Leaders
John Wooden: The Greatest Coach Ever?
Diamond devotes a chapter to John Wooden, the legendary UCLA basketball coach. Under Wooden, UCLA won 10 national championships, including seven in a row, a record no one has come close to matching.
Wooden was a “practice coach” who emphasized fundamentals. His practices were so fast and intense that games seemed slow by comparison. He paid attention to every detail, even how players put on their socks to prevent blisters. He redesigned his offense every year based on the players he had.
But Wooden also had advantages: UCLA was in Los Angeles, a basketball talent hotbed, and he had two generational players, Lew Alcindor (later Kareem Abdul-Jabbar) and Bill Walton. Still, five of his championship teams had neither player.
Diamond argues that Wooden’s unique contribution wasn’t just coaching technique, it was his philosophy of life. His “Pyramid of Success” emphasized cooperation, determination, honesty, persistence, and self-discipline, not just for basketball but for living. Players like Abdul-Jabbar and Walton have said Wooden influenced them more as human beings than as athletes.
The Firing Coaches Problem
But what about ordinary coaches? Do they matter?
Diamond cites research showing that coaches account for about 21% to 31% of variation in team success. That’s significant but not overwhelming.
Here’s the surprising part: when a coach with a losing record is fired, the team’s record usually improves the next year. But if you compare that improvement to what happens when a coach with the same losing record is not fired, the improvement is about the same.
This is regression to the mean. A team that had a terrible year is likely to have a better year next year, regardless of who’s coaching, just like a gambler who rolls a 1 is likely to roll a higher number next time.
Diamond uses a vivid analogy: imagine two coaches throwing dice. One rolls a 1 and gets fired. The new coach rolls a 2, and everyone celebrates. But the improvement was just chance.
So why do owners keep firing coaches? Diamond suggests several reasons:
- Ignorance, they don’t understand statistics.
- Appearances, firing a coach shows fans and media that you’re “doing something”.
- The scapegoat effect, someone has to take the blame.
- The Wooden curse, at UCLA, every basketball coach is compared to the greatest coach ever, and they all fall short.
Part 5: Religious Leaders
What Makes a Religion Succeed?
Diamond defines religion as having five attributes: belief in supernatural agents, belief that those agents can intervene in human affairs, a moral code, membership in a social movement, and costly visible proofs of commitment.
He then asks: why do some religions succeed while others fail?
The Mormon Story
The Church of Jesus Christ of Latter-day Saints (Mormons) is the most successful new religion of the last two centuries, with nearly 20 million members.
It was founded by Joseph Smith, a charismatic but poorly educated farm boy from New York who claimed to have been visited by an angel and to have translated golden plates into the Book of Mormon. Smith attracted followers, but his plural marriage practices and authoritarian leadership made him enemies. He was killed by a lynch mob in 1844.
The key to Mormon success was Brigham Young, who took over after Smith’s death. Young was an outstanding organizer. He led 20,000 Mormons on a 1,100-mile wagon train to Utah, where they established a thriving community.
Diamond argues that a successful religion needs both a charismatic founder and an outstanding organizer. Christianity had Jesus and Paul. Mormonism had Joseph Smith and Brigham Young. The Shakers had Ann Lee and Joseph Meacham and Lucy Wright.
The Shakers and Jim Jones
The Shakers were founded by Ann Lee, an illiterate English factory worker who was repelled by sex and marriage. She preached celibacy and communal living. At their peak in the mid-19th century, the Shakers had about 6,000 members in 20 communities.
Today, only two Shakers remain. Why did they decline? Because they couldn’t reproduce, they had to rely on converts and abandoned children, and because American society changed around them.
Jim Jones and the Peoples Temple represent the dark side of religious leadership. Jones was charismatic, energetic, and brilliant, but also paranoid, drug-addicted, and manipulative. In 1978, he ordered 918 of his followers to commit mass suicide by drinking cyanide-laced punch. It remains the largest mass suicide in American history.
Why Christianity Won
Diamond then asks the big question: why did Christianity become the world’s dominant religion?
He argues that Christianity had several advantages over its competitors:
- Jesus was a charismatic founder who preached a message of universal appeal.
- Paul was an outstanding organizer who insisted that converts didn’t have to follow Jewish laws (dietary rules, circumcision), making conversion much easier.
- Christianity cared for the sick, while pagan Romans left them to die. During plagues, Christians survived at higher rates.
- Christianity elevated women and families, prohibiting abortion and infanticide, while pagan Romans practiced both.
- Christianity attracted literate people, and literacy helped it spread.
- Emperor Constantine recognized Christianity as a unifying force and made it the official religion of the Roman Empire.
Diamond also points out that Christianity’s success wasn’t inevitable. There were other Jewish sects, the Essenes, the Pharisees, the Sadducees, and other charismatic preachers (John the Baptist, Theudas, the Egyptian Prophet). But Christianity had the right combination of features at the right time.
4. Profits, Prophets, Coaches, and Kings Analysis
Let me be honest with you. I have mixed feelings about this book.
What I loved:
Diamond is one of the most stimulating thinkers alive. He connects dots that other people don’t even see. The pomegranate juice story? Fascinating. The inbreeding monarchs study? Mind-blowing. The diplomatic parking tickets as a measure of corruption? Brilliant.
I also appreciate his willingness to use data. So many books about leadership are just anecdotes and platitudes. Diamond actually looks at numbers. He cites studies. He tries to test hypotheses.
What frustrated me:
Diamond’s “Hamlet test” is shaky. As the Guardian review points out, Marlowe might have written plays as good as Hamlet if he hadn’t been stabbed to death at 29. We simply don’t know.
Also, some of Diamond’s conclusions are obvious. “You need money to start a business that requires a lot of money”? No kidding.
And Diamond’s dismissive attitude toward scholars in other fields is off-putting. He seems to think he’s the first person to think rigorously about leadership, which is simply not true.
5. Strengths and Weaknesses
Strengths
1. Cross-disciplinary scope. Diamond draws on history, economics, statistics, sports science, and religious studies. This breadth is rare and valuable.
2. Use of natural experiments. The statistical comparisons are the book’s strongest contribution. They provide evidence that biographies alone can’t.
3. Memorable case studies. Seretse Khama, the Resnicks, John Wooden, these are vivid stories that stick with you.
4. Clear writing. Diamond explains complex ideas in accessible language. He’s a gifted communicator.
Weaknesses
1. The Hamlet test is flawed. As noted, we can’t know what dead contemporaries might have achieved.
2. Some conclusions are obvious. “Leaders with more power have more impact” isn’t exactly a revelation.
3. Dismissive of other scholars. Diamond acts like he’s inventing the wheel.
4. Uneven depth. Some sections are rich with detail; others feel rushed.
5. Limited practical advice. If you’re looking for “how to be a better leader,” this isn’t that book. It’s descriptive, not prescriptive.
6. Comparison with Similar Works
Profits, Prophets, Coaches, and Kings fits into a genre I’d call “big history meets social science.”
Similar books:
- The Better Angels of Our Nature by Steven Pinker, uses data to challenge assumptions about human behavior.
- Sapiens by Yuval Noah Harari, big-picture history with provocative arguments.
- Why Nations Fail by Daron Acemoglu and James Robinson, uses natural experiments to explain economic development.
What makes Diamond different: He’s more willing to mix biography with statistics. He also covers more ground, politics, business, sports, and religion in one book.
What makes Diamond similar: Like Pinker and Harari, he’s a big-picture thinker who writes for general audiences. Like Acemoglu and Robinson, he uses natural experiments as evidence.
7. Conclusion
Who Should Read This Book?
You’ll love this book if:
- You enjoy big-picture thinking and cross-disciplinary connections.
- You’re interested in why some leaders succeed and others fail.
- You appreciate data-driven arguments.
- You like memorable case studies (pomegranate juice, anyone?).
You might bounce off this book if:
- You prefer deep dives into single subjects.
- You’re looking for practical “how to be a leader” advice.
- You’re put off by statistical analysis.
- You’re skeptical of authors who claim to have discovered something new that scholars have somehow missed.
Final Verdict
Profits, Prophets, Coaches, and Kings is classic Jared Diamond: stimulating, frustrating, and unforgettable. It will make you think differently about leadership, even if you don’t agree with all of Diamond’s conclusions.
The book’s central insight, that leaders matter most when they have discretion and when they’re in the right place at the right time, is valuable. The case studies are memorable. The natural experiments are eye-opening.
But the book is also flawed. The Hamlet test doesn’t hold up. Some conclusions are obvious. And Diamond’s dismissive attitude toward other scholars is annoying.
Still, I’m glad I read it. It changed how I think about voting, about CEOs, about sports coaches, and about religious founders. And isn’t that what a good book should do?
