Mutualism and Justice

Proudhon's concept of Mutuality is that of Retributive Justice, a term which, regardless of its common usage, can apply to any reciprocity, positive or negative.  Now, Retributive Justice entails two, and only two parties.  In contrast, Distributive Justice can apply to any situation involving two or more parties.  So, in the case of any division of labor among three or more parties, only Distributive Justice is adequate.  Now, Proudhon plainly recognizes the need for collective production involving more than two workers.  So, his Mutualism is inadequate to his own ambition of a just society.