That "requires interpretation"......

.......................part is where it gets interesting:

All social values - liberty and opportunity, income and wealth, and the bases of self-respect  - are to be distributed equally unless an unequal distribution of any, or all, of these values is to everyone's advantage. Injustice, then, is simply inequalities that are not to the benefit of all. Of course, this conception is extremely vague and requires interpretation.

-John Rawls,  culled from The Main Idea Of The Theory Of Justice