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Difference Principle Application

Why It Matters

Provides specific criterion for evaluating inequality: not "is there inequality?" but "does this inequality help or harm the worst-off?" Permits meritocracy, markets, and incentive pay if they benefit the least advantaged.

The Key Move

For any proposed inequality, ask: Does this arrangement improve the position of the worst-off compared to more equal alternatives? If not, it's unjust. If yes, it's permitted even if it increases inequality.

Classic Application

Progressive taxation funding social insurance. Unequal post-tax incomes acceptable if the inequality (via work incentives) generates enough surplus that the worst-off (after redistribution) are better off than under strict equality.

Surprising Application

Open source project governance. Is it fair that core maintainers have more authority than occasional contributors? Difference principle answer: Only if this arrangement benefits the worst-off contributor position - by making the project more valuable/sustainable than equal authority would.

Failure Modes

  • Assuming difference principle requires equalizing outcomes (it permits inequality)
  • Ignoring empirical questions about what actually benefits the worst-off
  • Treating any benefit to worst-off as justifying unlimited inequality (principle is maximal benefit)
  • Comparing worst-off positions across different systems without considering feasibility

Go Deeper

Rawls, "Justice as Fairness: A Restatement" (2001); Cohen, "Rescuing Justice and Equality" for critique and refinement.