This would help to evade avidity and competition, as well as domination of private interests over the social ones. The territory of an ideal state should not be too vast and over-populated, to escape the emergence of expansionist tendencies, being the source of external wars and internal clashes. .
The notion of "justice- as applied until now in law, matches better Plato's concept than the notion of "justice-, as used in political speculations. Under the impact of democratic theory we started associating justice with equality, however, it didn't have such a meaning for Plato. In the sense, in which "justice- is almost the synonym of law, if for instance, we are speaking about "court-, justice concerns, primarily, the rights of property, which have no relation to equality. The first definition of "justice-, offered in the starting pages of "Res publica-, says that it consists in paying debts. Rather soon, this definition is left aside as inappropriate, however certain part of it is referred to at the end. One should express several considerations concerning Plato's definition. Firstly, it does not allow an opportunity for inequality in power, and privileges without justice. The guards should possess all the power as soon as they are the wisest members of the community; according to Plato, injustice would take place only if the people belonging to other strata would excel some of the guardsmen in wisdom. That's why Plato envisages promotion and demotion of citizens, although he assumes that in most cases double privilege of birth and education would lead to superiority of guards' children over the children from other strata. If there were a more adequate science of administration, and if there were more confidence that the people would follow its guidelines, there would be much in favour of Plato's system. .
In his book, Bertrand Russell makes the following analogy. None considers it just to include the best football-players into a football team, although thus they gain a great superiority.