"Justice as Fairness: Political not Metaphysical" is an essay by John Rawls, published in 1985. In it he describes his conception of justice. It comprises two main principles of liberty and :wikt:equality|equality; the second is subdivided into Fair Equality of Opportunity and the Difference Principle. Rawls arranges the principles in 'lexical priority', prioritising in the order of the Liberty Principle, Fair Equality of Opportunity and the Difference Principle. This order determines the priorities of the principles if they conflict in practice. The principles are, however, intended as a single, comprehensive conception of justice—'Justice as Fairness'—and not to function individually. These principles are always applied so as to ensure that the "least advantaged" are benefitted and not hurt or forgotten. Rawls originally presented the theory in his 1971 book A Theory of Justice, subsequently expanding upon several of its themes in his later book titled Political Liberalism.
First principle: the liberty principle
The first and most important principle states that every individual has an equal right to basic liberties, Rawls claiming "that certain rights and freedoms are more important or 'basic' than others". For example, Freeman argues, Rawls believes that "personal property" – personal belongings, a home – constitutes a basic liberty, but an absolute right to unlimited private property is not. As basic liberties, these rights are inalienable: no government can amend, infringe or remove such rights from individuals. Thomas Mertens says Rawls contends that principles for a society are just when chosen by representative citizens placed within "fair" conditions. In A Theory of Justice, Rawls articulates the Liberty Principle as the most extensive basic liberty compatible with similar liberty for others; he later amended this in Political Liberalism, stating instead that "each person has an equal claim to a fully adequate scheme of equal basic rights and liberties".
Second principle: the equality principle
The Equality Principle is the component of Justice as Fairness establishing distributive justice. Rawls awards the Fair Equality of Opportunity Principle lexical priority over the Difference Principle: a society cannot arrange inequalities to maximize the share of the least advantaged whilst not allowing access to certain offices or positions.
This principle maintains that "offices and positions" should be open to any individual, regardless of his or her social background, ethnicity or sex. It is stronger than 'Formal Equality of Opportunity' in that Rawls argues that an individual should not only have the right to opportunities, but should have an effective equal chance as another of similar natural ability.
Difference principle
The Difference Principle regulates inequalities: it only permits inequalities that work to the advantage of the worst-off. This is often misinterpreted as trickle-down economics; Rawls' argument is more accurately expressed as a system where wealth "diffuses up". By guaranteeing the worst-off in society a fair deal, Rawls compensates for naturally occurring inequalities. Rawls justifies the Difference Principle on the basis that, since Fair Equality of Opportunity has lexical priority, the Just choice from Pareto optimal scenarios which could occur would be that benefiting the worst-off rather than the best-off.
Original position
A key component of Rawls' argument is his claim that his Principles of Justice would be chosen by parties in the original position. This is a thought experiment in which the parties select principles that will determine the basic structure of the society they will live in. This choice is made from behind a veil of ignorance, which would deprive participants of information about their particular characteristics: his or her ethnicity, social status, gender and, crucially, their conception of the good. This forces participants to select principles impartially and rationally.
