 As indicated, there is also a third, more suitable approach to the equality ideal: a constitutive egalitarianism. According to this approach, to the aspiration to equality is rooted in other moral grounds, namely because certain inequalities are unjust. Equality has value, but this is an extrinsic value, since it derives from another, higher moral principle of equal dignity and respect. But it is not instrumental for this reason, i.e., it is not only valued on account of moral equality, but also on its own account. (For the distinction between the origin of a value and the kind of value it is, cf. Korsgaard 1996.) Equality stands in relation to justice as does a part to a whole. The requirement of justification is based on moral equality, and in certain contexts, successful justification leads to the above-named principles of equality, i.e., formal, proportional equality and the presumption of equality. Thus, according to constitutive egalitarianism, these principles and the resulting equality are required by justice, and by the same token constitute social justice.