Abstract
The varying demands of justice are often thought to depend on a distinction between natural and social inequalities, but making this distinction has been little discussed, and it has been dismissed by philosophers of biology. It cannot be established by a simple causal criterion, nor by use of the analysis of variance, nor by distinguishing the innate from the acquired. Whether an inequality can be socially controlled provides the most plausible criterion, so 'natural' and 'social' are misleading labels for types of inequality. The analysis of these depends, besides, on how fine-grained the descriptions are; so it is implausible to think that the natural/social distinction, when drawn in terms of social control, is relevant to theories of justice.