 Here the difference principle selects Economy C, because it contains the distribution where the least-advantaged group does best. Inequalities in C are to everyone’s advantage relative to a completely equal distribution (Economy A), and relative to a more equal distribution (Economy B). But the difference principle does not allow the rich to get richer at the expense of the poor (Economy D). The difference principle embodies equality-based reciprocity: from an egalitarian baseline, it requires that any inequalities are good for all, and especially for the worst-off.