 Some theories of justice cannot readily be classified either as comparative or as non-comparative. Consider one part of Rawls’ theory of social justice, the difference principle, which as noted above requires that social and economic inequalities be arranged to the greatest benefit of the least advantaged (Rawls 1971, 1999, §12–13). Under this principle, ideally just shares are calculated by determining what each person would receive under the set of social institutions whose economic effect is to raise the worst off person to the highest possible level. This is neither a fixed amount, nor one that depends in any direct sense on what other individuals are receiving, or should receive. Applying the difference principle does require making comparisons, but these are comparisons between the effects of different social institutions – say different tax laws, or different ways of defining property rights – not between individual people and the amounts of benefit they are receiving. We might call theories of this kind ‘holistic’ or ‘systemic’.