Many arguments against sharing power or wealth rest on the same claim: human beings are selfish by nature. Take away the threat of poverty or the promise of profit, the story goes, and people will contribute nothing, share nothing, and care about no one. Greed becomes realism. Cooperation becomes a childish fantasy.
That story confuses one human capacity with the whole person. Selfishness is real, alongside sympathy, fairness, spite, and the stubborn urge to help somebody who cannot repay you. We are messy creatures. The doctrine of inevitable selfishness flattens that mess into an alibi for greed, then dresses the alibi up as science.
The simplification that escaped the textbook
One influential economic version began as an explicit simplification. John Stuart Mill wrote that political economy considered a person only as someone who “desires to possess wealth” and can judge the best means of getting it. He also warned that this was an “arbitrary definition of man” used to isolate one motive for study. Mill said no economist should imagine that actual people have no desires besides wealth.
The abstraction later acquired a name, homo economicus, and too often escaped its original limits. A narrow model for studying choices became a folk theory of human nature. When people refuse to behave like tidy wealth maximizers, the model treats the person as the error.
The selfishness story takes a useful model of people acting as if money were their only motive and turns it into a claim that money is their only real motive. Mill knew the difference. Anyone using his abstraction as a biography of the species should know it too.
Real people keep breaking the model
The ultimatum game makes the problem visible. One person proposes how to split a sum of money. The other can accept or reject the offer. Rejection leaves both with nothing. A person interested only in maximizing cash should accept any positive amount.
People do something else with surprising regularity. A meta-analysis of 37 studies found that proposers offered an average of 40 percent and responders rejected 16 percent of offers. Culture, stakes, experience, and framing all matter, and researchers still debate what motivates rejection. The result is evidence against pure cash maximization, though it cannot establish pure altruism. Sometimes fairness matters enough that people pay to enforce it.
Developmental psychology creates another problem for the selfishness story. Felix Warneken and Michael Tomasello found that children as young as 18 months helped without prompting, even when doing so meant stopping play or crossing an obstacle. Caregivers were absent, no reward was offered, and later work found that external rewards could crowd out the impulse to help.
The Stanford Encyclopedia of Philosophy is careful about what those studies establish. Toddlers may already have learned that helping wins approval, and the experiments do not eliminate every egoistic explanation. The evidence is suggestive rather than decisive. That caution cuts both ways. Anyone insisting that self-interest explains everything now has an explanation to prove, rather than a law of nature to invoke.
C. Daniel Batson spent decades testing proposed selfish explanations for empathy-driven helping. Easier escape from another person’s distress did not reliably stop help. Secrecy also failed to stop it after removing the threat of social punishment. The SEP review of the evidence calls the results “very bad news for psychological egoism.” Another SEP review adds an important limit: Batson ruled out several egoistic accounts without proving that every unexplained act came from a pure altruistic desire. The evidence narrows what we can claim. One theory cannot simply swallow every possible result.
A theory that cannot lose explains nothing
Psychological egoism often survives counterexamples by renaming them. The soldier who falls on a grenade wanted to avoid guilt. The anonymous donor wanted a warm feeling. The toddler wanted approval. Every act of care becomes selfish once satisfaction is defined as selfishness.
At that point the doctrine is a tautology. If self-interest means doing whatever one most wants, every intentional action counts as self-interested by definition. The theory cannot distinguish a soldier who falls on a grenade to save others from a soldier who pushes someone else onto it to save himself. As the SEP entry explains, that version cannot be refuted by observation, which also means observation can never confirm it.
Gregory Kavka’s narrower “predominant egoism” survives this objection. It allows rare acts of sacrifice, usually for friends, family, or favorite causes, while claiming that selfish motivation dominates. The SEP entry calls that view empirically plausible. Wars, hoarding, betrayal, and ordinary cruelty give it plenty to work with.
History, however, contains too much cooperation for cruelty to settle the question by itself. Rutger Bregman reported in The Guardian on six Tongan boys, ages 13 to 16, who survived for 15 months on the uninhabited island of ‘Ata after a 1965 shipwreck. They kept a permanent fire, built a food garden, worked in pairs on a duty roster, settled fights with time-outs, and cared for a boy who broke his leg. Mano Totau, one of the six, later described the ordeal directly.
One group of castaways cannot define humanity any more than a war can. William Golding’s fictional boys killed one another, and generations treated the novel as a revelation about human nature. The real boys organized, argued, repaired the damage, and survived. Their story leaves no room for claims that collapse into domination is inevitable.
Who profits from inevitability
Calling selfishness natural turns every cruel arrangement into reluctant wisdom. Poverty must frighten people into working. Wealth must reward the supposedly exceptional. Public goods must fail because strangers cannot cooperate. The people collecting the rewards get to present their advantage as obedience to biology.
The evidence offers no such permission. Human beings can exploit and hoard. We can also reject profitable unfairness, help without a promised reward, and build rules that keep a stranded group alive. Which capacity wins depends partly on what our institutions reward, punish, and teach us to expect from one another.
That is why the fight over human nature matters. If greed is destiny, injustice is merely realistic. If selfishness is one possibility among several, institutions have choices and so do we. Greed is human. Cooperation is human too. Anyone who builds a system around the first and starves the second made a moral decision. They do not get to blame the species for it.