The Veil of Ignorance and the Search for Fair Rules

The thought experiment asks you to stand behind a veil of ignorance. You know general facts about people and society, but you do not know your own future place. You might be powerful or vulnerable, wealthy or poor, part of a majority or a minority.

Without that information, choosing rules that favour one particular group becomes risky. A system that looks comfortable for the powerful could become frightening if you later discover that you occupy the weakest position. The veil encourages you to consider rules from several possible lives rather than only your current one. You also do not know which natural talents society will reward or whether events beyond your control will change your life.

The experiment does not ask you to forget everything about human needs. You can still know that people value freedom, safety, opportunity and resources. What is hidden is the personal information that could tempt you to design the rules around your own advantage.

Rawls argued that people in this original position would protect basic liberties and pay close attention to the condition of those who are least advantaged. They might accept some inequalities if those inequalities improve the system for everyone, including people near the bottom. The reasoning is cautious because no one knows which place will become their own.

Other philosophers disagree about what people would choose. Some think individuals would favour stronger personal freedom, equal resources, shared welfare or different ideas of desert. The thought experiment does not automatically settle those debates. It creates a disciplined way to expose which risks and values a theory prioritises.

Uncertainty is central. A person behind the veil cannot safely assume that talent, effort or good fortune will place them at the top. This makes the experiment useful when discussing education, healthcare, taxation, disability access or legal rights, although real policies still require evidence and practical detail. It can also reveal when a policy protects average outcomes while leaving a smaller group exposed to severe harm.

When considering a rule, imagine several positions you might occupy. Then compare the answers instead of relying on the viewpoint that happens to be most convenient today.

• •Would I accept this rule from the weakest position?
• •Does everyone keep basic rights?
• •Who receives the benefits and burdens?
• •Could unequal outcomes improve life for those with less?
• •Which personal advantage is shaping my judgement?

Rawls set out the thought experiment most fully in A Theory of Justice, published in 1971. He argued that people behind the veil would choose two principles: equal basic liberties for everyone, and a rule allowing social and economic inequalities only when positions are open to all under fair equality of opportunity and the inequalities benefit the least advantaged. That second condition is known as the difference principle. His reasoning resembles a strategy called maximin, which means choosing the option whose worst outcome is the best available.

Not everyone agreed that maximin is the rational choice. The economist John Harsanyi argued that people facing uncertainty would instead maximise average well-being, treating each position as equally likely, which could accept some very bad outcomes if the overall average were higher. The philosopher Robert Nozick objected from a different direction. He argued that justice depends on how holdings were acquired and transferred, not on whether the final pattern of distribution fits a chosen principle. These disagreements show how the same imagined situation can support very different conclusions.

A familiar everyday version of this reasoning is the rule for sharing a cake between two people: one cuts and the other chooses. The cutter has a strong reason to make the pieces equal, because any larger slice will be taken by the other person. Rawls used a similar cake example in A Theory of Justice to illustrate a fair procedure. You do not need goodwill for the method to work. The structure of the situation turns self-interest towards a fair result, which is the same move the veil makes on a much larger scale.

This points to a common misreading. The veil does not assume that people are saints. In Rawls's account the parties are mainly concerned with advancing their own interests, and they are not imagined as feeling envy or love for one another. Fairness comes from the missing information, not from generous motives. It also is not a description of something that ever happened. No real group has met behind a veil to write a constitution. It is a device for checking arguments, and you can use it at any time by asking whether your reasons would survive the loss of your own position.

Numbers show how the rival rules differ. Imagine three possible societies, each with three equally likely positions. In society A, incomes are 5, 60 and 100, giving an average of 55. In society B they are 25, 30 and 35, an average of 30. In society C they are 20, 45 and 70, an average of 45. A maximin chooser picks B, because its worst position, 25, is the best of the three worst cases. An average maximiser, following Harsanyi, picks A despite its miserable bottom place. A third rule sets a guaranteed minimum, say 15, rules out A and then picks the highest average, which is C.

Researchers have tried to test which rule real people prefer. In a series of experiments from the late 1980s, the political scientists Norman Frohlich and Joe Oppenheimer asked small groups to agree on a principle for distributing income before learning which income they would receive, then paid them according to the result. Very few groups chose Rawls's maximin rule. Most chose the third option, maximising average income while guaranteeing a floor. Critics reply that a laboratory game played for modest sums is not the original position, but the results show why the choice behind the veil remains genuinely contested.

Some critics accept the veil but argue that Rawls drew its edges too narrowly. In Justice, Gender, and the Family, published in 1989, the political philosopher Susan Moller Okin pointed out that Rawls treated the family as a basic institution yet largely assumed it was just. She argued that if people behind the veil did not know their sex, they would never accept arrangements in which women carried most unpaid caring work and lost income and security as a result. For Okin, the veil was a powerful tool that had not yet been turned on the household.

Others have asked who takes part in the agreement at all. Rawls imagined the parties as roughly equal, able to cooperate fully throughout their lives, and members of a single society. The philosopher Martha Nussbaum, in Frontiers of Justice in 2006, argued that this leaves out people with severe disabilities, people in other countries and non-human animals, none of whom fit the picture of equal contracting partners. Other writers, such as Charles Beitz and Thomas Pogge, have argued for applying the veil worldwide, so that nobody knows which country they will be born in. Rawls himself declined to go that far in his later book The Law of Peoples.

The veil of ignorance asks you to choose rules without knowing how those rules will affect you personally. It does not produce one automatic answer, but it makes self-serving reasoning harder to hide. By imagining several possible positions, you can test whether a rule deserves to be called fair.