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Theories of distributive justice
Theories of distributive justice need to answer three questions:


 * 1) What goods are to be distributed? Is it to be wealth, power, respect, opportunities or some combination of these things?
 * 2) Between what entities are they to be distributed? Humans (dead, living, future), sentient beings, the members of a single society, nations?
 * 3) What is the proper distribution? Equal, meritocratic, according to social status, according to need, based on property rights and non-aggression?

Distributive justice theorists generally do not answer questions of who has the right to enforce a particular favored distribution. On the other hand, property rights theorists argue that there is no "favored distribution." Rather, distribution should be based simply on whatever distribution results from lawful interactions or transactions (that is, transactions which are not illicit).

This section describes some widely held theories of distributive justice, and their attempts to answer these questions.

Social justice
According to the egalitarian, justice can exist only within the parameters of equality. This basic view can be elaborated in many ways, according to what goods are to be distributed – wealth, respect, opportunity – and who or what they are to be distributed equally among – individuals, families, nations, races, species. Egalitarian theories are typically less concerned with discussing who exactly will do the distributing or what effects their recommended policies will have on the production of the goods, services, or resources they wish to distribute.

Commonly held egalitarian positions include demands for equality of opportunity, though equality of opportunity is often defended by adherents of nonegalitarian conceptions of justice as well. Some variants of egalitarianism affirm that justice without equality is hollow and that equality itself is the highest justice, though such a formulation will have concrete meaning only once the main terms have been fleshed out.

At a cultural level, egalitarian theories have developed in sophistication and acceptance during the past two hundred years. Among the notable broadly egalitarian philosophies are communism, socialism, left-libertarianism, and progressivism, which propound economic, political, and legal egalitarianism, respectively.

Fairness
In his A Theory of Justice, John Rawls used a social contract argument to show that justice, and especially distributive justice, is a form of fairness: an impartial distribution of goods. Rawls asks us to imagine ourselves behind a veil of ignorance that denies us all knowledge of our personalities, social statuses, moral characters, wealth, talents and life plans, and then asks what theory of justice we would choose to govern our society when the veil is lifted, if we wanted to do the best that we could for ourselves. We don't know who in particular we are, and therefore can't bias the decision in our own favour. So, the decision-in-ignorance models fairness, because it excludes selfish bias. Rawls argues that each of us would reject the utilitarian theory of justice that we should maximize welfare (see below) because of the risk that we might turn out to be someone whose own good is sacrificed for greater benefits for others. Instead, we would endorse Rawls's two principles of justice:


 * Each person is to have an equal right to the most extensive total system of equal basic liberties compatible with a similar system of liberty for all.
 * Social and economic inequalities are to be arranged so that they are both
 * to the greatest benefit of the least advantaged, consistent with the just savings principle, and
 * attached to offices and positions open to all under conditions of fair equality of opportunity.

This imagined choice justifies these principles as the principles of justice for us, because we would agree to them in a fair decision procedure. Rawls's theory distinguishes two kinds of goods – (1) the good of liberty rights and (2) social and economic goods, i.e. wealth, income and power – and applies different distributions to them – equality between citizens for (1), equality unless inequality improves the position of the worst off for (2).

In one sense, theories of distributive justice may assert that everyone should get what they deserve. Theories disagree on the meaning of what is "deserved". The main distinction is between theories that argue the basis of just deserts ought to be held equally by everyone, and therefore derive egalitarian accounts of distributive justice – and theories that argue the basis of just deserts is unequally distributed on the basis of, for instance, hard work, and therefore derive accounts of distributive justice by which some should have more than others.

According to meritocratic theories, goods, especially wealth and social status, should be distributed to match individual merit, which is usually understood as some combination of talent and hard work. According to needs-based theories, goods, especially such basic goods as food, shelter and medical care, should be distributed to meet individuals' basic needs for them. Marxism is a needs-based theory, expressed succinctly in Marx's slogan "from each according to his ability, to each according to his need". According to contribution-based theories, goods should be distributed to match an individual's contribution to the overall social good.

Property rights
In Anarchy, State, and Utopia, Robert Nozick argues that distributive justice is not a matter of the whole distribution matching an ideal pattern, but of each individual entitlement having the right kind of history. It is just that a person has some good (especially, some property right) if and only if they came to have it by a history made up entirely of events of two kinds:


 * Just acquisition, especially by working on unowned things; and
 * Just transfer, that is free gift, sale or other agreement, but not theft (i.e. by force or fraud).

If the chain of events leading up to the person having something meets this criterion, they are entitled to it: that they possess it is just, and what anyone else does or doesn't have or need is irrelevant.

On the basis of this theory of distributive justice, Nozick argues that all attempts to redistribute goods according to an ideal pattern, without the consent of their owners, are theft. In particular, redistributive taxation is theft.

Some property rights theorists (like Nozick) also take a consequentialist view of distributive justice and argue that property rights based justice also has the effect of maximizing the overall wealth of an economic system. They explain that voluntary (non-coerced) transactions always have a property called Pareto efficiency. The result is that the world is better off in an absolute sense and no one is worse off. Such consequentialist property rights theorists argue that respecting property rights maximizes the number of Pareto efficient transactions in the world and minimized the number of non-Pareto efficient transactions in the world (i.e. transactions where someone is made worse off). The result is that the world will have generated the greatest total benefit from the limited, scarce resources available in the world. Further, this will have been accomplished without taking anything away from anyone unlawfully.

Welfare-maximization
According to the utilitarian, justice requires the maximization of the total or average welfare across all relevant individuals. This may require sacrifice of some for the good of others, so long as everyone's good is taken impartially into account. Utilitarianism, in general, argues that the standard of justification for actions, institutions, or the whole world, is impartial welfare consequentialism, and only indirectly, if at all, to do with rights, property, need, or any other non-utilitarian criterion. These other criteria might be indirectly important, to the extent that human welfare involves them. But even then, such demands as human rights would only be elements in the calculation of overall welfare, not uncrossable barriers to action.