The idea that social and economic inequalities must be to the greatest benefit of the least-advantaged members of society is called the difference principle.
Rawls' claim was that departures from equality of a list of primary goods.
Things which a rational man wants whatever is justified only to the extent that they improve the lot of those who are worst-off under the given distribution in comparison with the previous and equal distribution.
His position is at least in same sense, with a provision that inequalities are allowed only when they benefit the least advantaged.
An important consequence of Rawls' view was that inequalities can actually be as long as they are to the benefit of the least.
His argument for the given position defines heavily the claim that morally arbitrary factors should not determine life chances of the person or opportunities given to someone.
Rawls was also determined to an intuition that a person does not morally deserve their inborn talents.
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