The Social Contract - Rawls
John Rawls was the most influential political philosopher of the 20th Century to the extent that his great work "A Theory of Justice" has been cited in U.S. law courts when delivering judgements. In it Rawls defined what became a kind of orthodoxy for American liberalism. Equality of opportunity with guarantees for the least fortunate.
He argued that equality should be the starting point for all fair wealth distributions but that inequality could be just if and only if that was to the benefit of the least well off. I.e. you are allowed to earn more than me if we are both better off than if we were equal. For example, if you start a business that provides me a job that increases my standard of living, then you are allowed to take more profit than I earn but only so long as any increase in your wealth also increases mine.
This contrasts with Nozick's emphasis on procedural justice (just actions lead to just results) and so Rawls feels the need to explain that this principle is one that the members of society would freely enter into in some way. That makes it a kind of choice hence addressing the intuitive appeal of Nozick's argument that giving up our own wealth to others should be voluntary. This is what is called a "Social Contract" argument.
Centuries previously the social contract in an early form was proposed by Thomas Hobbes as a way of explaining why free individuals would choose to subject themselves to laws. The alternative, as he put it, would be "..the life of man: nasty, brutish and short".
However, survival alone does not provide an explanation why selfish individuals who are talented or strong would agree to exactly what Rawls feels is just. Presumably they might drive a harder bargain.
To tackle this, Rawls came up with the "veil of ignorance". If you didn't know who in a society you would be, either billionaire or beggar then you would choose to minimise the suffering you might need to endure as the poorest. The "veil of ignorance" is the fair way to choose because you are making a choice while having to place yourself in the position of anyone else in society rather than being allowed to be selfish.
What do you think about the veil of ignorance? Is it a problem that there isn't actually a contract and we never actually agree to anything? Does it matter that the poorest may not have had to work as hard as the rich? Do the poorest in society lose anything by this agreement?