Today I want to discuss a concise yet profound book — The Basic Laws of Human Stupidity. The author is Italian economic historian Carlo Cipolla.
This book began as a short essay Cipolla wrote in 1976, originally circulated only among friends. Unexpectedly, it spread widely. In 1988, it was published in Italian; the English edition (The Basic Laws of Human Stupidity) followed in 2011. By the 2019 reprint, none other than Nassim Taleb, author of The Black Swan, contributed the foreword.
Since it presents the "Basic Laws of Human Stupidity," Cipolla first defines "stupidity." He devises a classification system: self-interest on the horizontal axis, benefit to others on the vertical axis, dividing everyone into four categories.
1. The Intelligent
The intelligent benefit both themselves and others. This behavior iswin-win: not only do they gain personally, but total social value increases. They are the backbone of social progress.
Classic examples are entrepreneurs in free markets — they create delicious food, comfortable homes, useful software, entertaining games, compelling shows, and breakthrough technologies. These previously nonexistent products and services not only meet people's needs but raise overall social efficiency. Entrepreneurs profit, while people's lives improve through their creations.
2. The Bandit
Bandits are selfish; they act in their own interest while harming others, profiting at others' expense.
Bandits split into two types. One typegains significantly while others' losses are relatively small. Cutting in line, for instance: you save time, others wait a bit longer, but if you're genuinely in a rush, society's total loss isn't huge.
The other type is far more troubling: they inflict enormous harm on others for trivial gain. A thug who kills someone for a few thousand dollars — the victim's life vastly outweighs that sum, yet the thug doesn't care. Such people are a cancer on society.
3. The Helpless
The helpless benefit others at great cost to themselves. Some arechronic people-pleasers, unable to refuse demands, ending up exhausted; some fall for scams, enriching fraudsters while losing everything; some areselfless givers, sacrificing their entire lives for spouse and children.
Cipolla does not advocate becoming helpless. The reason is simple:your loss is still a loss. Endless self-sacrifice adds nothing to total social gain and only encourages bandit behavior.
4. The Stupid
Cipolla's focus is the fourth category —the stupid. They harm others and themselves, contributing absolute negative value to society, specializing in lose-lose actions.
In daily life, a minor conflict could be resolved amicably, but they escalate it, making a scene until everything blows up — others suffer, and they fare no better.
In bureaucracy, this is rampant. Some don't try to do their job well; instead they sabotage colleagues, fearing others' success might outshine them. Some love snitching, unable to tolerate peers doing well, using reports to curry favor with superiors. Some revel in bureaucratic red tape: a one-day task gets dragged out for weeks. They claim to "uphold rules" but actually wield whatever power they have to harass others, taking pleasure in making difficulties, protecting their ridiculous egos.
The stupid are those who cause losses to others or groups while gaining nothing themselves, even suffering losses. They don't seek win-win, nor do they harm others for self-gain — they specialize in lose-lose.
They are the most destructive group because their behavior is utterly illogical and unpredictable, severely undermining rules and order.
Note: "stupid" here doesn't mean occasionally doing something foolish or making a mistake. It means those whopersistently, habitually do stupid things. Assign them a task, and nine times out of ten it goes wrong — a stable personality trait.
This trait breaks down into two main aspects:
First, closed-mindedness, cognitive rigidity.
They score extremely low on the "Openness" dimension of the Big Five personality traits. They habitually use simplistic, crude frameworks to understand a complex world, explaining everything through fixed, rigid preconceptions. They refuse to update their worldview with new information, clinging to outdated mental models. If such people happen to wield power, they easily develop an "authoritarian personality." Research suggests this type comprises roughly15%–20%of the population.
Second, supreme overconfidence.
This is the famous "Dunning–Kruger Effect": the less competent people are, the less they recognize their incompetence, and the more confident they become — often more so than genuinely competent people. They lack self-reflection; their decisions are simplistic and emotional. Such people constitute about25%of humanity.
From this, Cipolla formulated five "Basic Laws of Human Stupidity," here called Cipolla's Laws.
1. Everyone inevitablyunderestimates the number of stupid people in society
Stupid people are everywhere, yet we overlook them. Why? We habitually assume others are as rational as we are, forgetting that stupidity is the norm. Precisely because of this, their existence and the damage they cause catch us off guard.
2. The probability that a given person is stupid is independent of all their other characteristics
Many assume less-educated people have a higher stupid ratio, while elites have a lower one. But Cipolla's research arguesstupidity is innate— unrelated to education, wealth, occupation, or social status.
He examined diverse groups — blue-collar workers, white-collar employees, students, administrators, university professors — and found the proportion of stupid peoplestrikingly consistent. Cipolla named this fixed ratioσ (the stupidity ratio).
He even studied Nobel laureates and found that even among this pinnacle of human intellect and achievement, the stupid ratio remainedσ. In other words,no matter which circle you're in, stupid people always exist at the same proportion.
Why do scientists also contain many stupid people? BecauseIQ and rational decision-making are two different things. High-IQ people ace exams and may make major discoveries, but that doesn't mean they possess rational judgment in human relations or administrative skill. Put them in charge, and they can screw things up just as badly.
If even scientists — who live by genuine talent — are like this, politics and business, where "padding" is rampant, need no further comment.
Can we roughly estimate the stupidity ratio σ? All factors considered, this ratiolikely falls between 10%–15%. That is,in every 8–10 people, there is at least one stupid person.
Other studies offerindirect evidence. Mathematicians find that errors, accidents, and disasters in society occur far more frequently than randomness can explain. If errors were purely random, they'd follow a normal distribution:mathematically speakingserious accidents should be extremely rare outliers.
Reality differs. Accidents follow a "fat-tail distribution":serious accidents far exceed random-model predictions. Where's the discrepancy? Only the stupid can account for it.
3. The stupid harm others without benefiting themselves,specializing in lose-lose outcomes
4. Non-stupid people always underestimate the destructive power of the stupid
5. The stupid are more dangerous than bandits
These three are best explained together. When intelligent people and bandits encounter the stupid, they make the same fatal error: underestimating them, not taking them seriously, assuming their stupidity only hurts themselves. The result...
The intelligent and bandits are both rational. They know what they're doing and what they want. You can influence them with threats or incentives, negotiate and game with them. Bandits may be untrustworthy, but if you align interests properly, they'll temporarily work for you.
The stupid are entirely different.They lack rationality, completely unaware of what they're doing, unable to grasp the link between their actions and purposes. Therefore you can neither influence nor exploit them. Their talent is wreaking havoc at the most unexpected moments.
Perhaps a company's leadership promotes a candidate precisely because he seems stupid, thinking he'll be easy to control. This is a colossal mistake. The stupid are the least controllable — threats and bribes both fail. They'll wreck everything with some incomprehensible obsession and methodology.
But why would evolution allow the stupid to persist? Shouldn't they have been weeded out? How did the "stupidity gene" survive?
Stupidity can be viewed as an "evolutionarily stable strategy." If every individual were perfectly rational, well-designed rules and incentives could control the whole system. That seems efficient, but the system becomes extremely fragile. Once the environment shifts or rules break, the entire species could face instant extinction.
Nature abounds with similar examples. In a school of fish, individuals follow and imitate each other, but some fish "refuse to follow the script." These "rule-breakers" make the school's overall trajectory chaotic and imprecise — and precisely because of this, predators can't predict the school's movement, raising the group's overall survival rate.
In the 19th century, the Irish heavily relied on potatoes as a staple. Pursuing maximum yield, they planted almost exclusively one variety (the Irish Lumper). Rationally, this was optimal: uniform variety, high yield, easy management. But the system was too monocultural, too brittle.
In 1845, potato blight swept Europe. The single variety had zero resistance; the crop failed completely. The result: the Great Famine, mass starvation, and huge waves of Irish emigration to America (directly fueling U.S. prosperity). That "rationally optimal" single choice plunged the nation into catastrophic collapse.
Had Ireland cultivated more diverse potato varieties — even lower-yielding, less palatable ones — at least some would have survived the blight, preventing total collapse.
So it is precisely because some individuals carry seemingly irrational, even defective gene combinations that groups stand a better chance of surviving sudden catastrophes. Diversity is fundamentally a "fault-tolerance mechanism."
Likewise, if a group contains some stupid people, their unpredictability — you never know what they'll do next — forces the system not to rely on overly complex, precision-engineered game designs, nor to hatch grand century-spanning master plans. Instead, it must muddle through step by step, clumsily but stably iterating.
The stupid make systems error-prone, yet it is precisely this instability that makes systems more robust.
Understanding the "Basic Laws of Human Stupidity" reveals that the world is unequivocally a makeshift operation (草台班子 — a slapdash, improvised outfit).
We often mock conspiracy theorists for believing "bankers control the world" and similar nonsense. But now another crowd has emerged — call them "grand-strategy theorists." They constantly claim "the leadership is playing 4D chess," as if everything is meticulously orchestrated, deeply planned, flawlessly calculated. How is this different from conspiracy theorists? It's just believing an omniscient, omnipotent deity is pulling the strings.
Just consider: even among Nobel laureates — humanity's most rational cohort — the stupid exist at ratio σ. Therefore no institution or company can possibly be a "precision instrument." It is inevitably a system that can screw up at any moment.
Grasp this, and you'll no longer be shocked by others' stupidity, nor tormented by the absurdity and leakiness of it all. You simply refuse to engage, distance yourself from the drain. Because the world is fundamentally a garbage-in, garbage-out place. Looking back at history, the occasional tiny step forward isn't a given — it's a stroke of immense luck, for which we should be grateful.