 Suppose we have two people A and B, of whom one is significantly better off than another – has greater opportunities or a higher income, say. Why should this be a concern of justice? It seems it will not be a concern unless it can be shown that the inequality between A and B can be attributed to the behaviour of some agent, individual or collective, whose actions or omissions have resulted in A being better off than B – in which case we can ask whether the inequality between them is justifiable, say on grounds of their respective deserts. This reiterates the claim in 1.4 above that without an agent to whom the outcome can be attributed there can only be justice or injustice in a metaphorical, ‘cosmic’, sense. Relational theorists claim that when people associate with one another in the relevant way, they become agents of justice. On a small scale they can organize informally to ensure that each receives what is due to him relative to the rest. On a larger scale, distributive justice requires the creation of legal and other institutions to achieve that outcome. Moreover failure to co-ordinate their actions in this way is likely to be a source of injustice by omission.