The answer is: it does not tell us exactly what a just society would look like and that it treats justice more as a process than as a goal.
This happen because Post-modern approach sees that what considered to be a justice by a certain group of people might not necessarily seen as so by the other group of people.
Because of this, they treat justice as a process, in which people made the effort to compromise with each other regardless of our difference/
The term Nouveau riche referes to those people who used to be poor or semi poor and manage to become wealthy, which may lead to anxiety since high class meetings and social codes are not what they are used to.