This chapter considers how the joke about breeches fitted into a way of thinking about human association that set decorum alongside justice, reciprocity alongside property, distinction alongside equality, fashion alongside price competition, equity alongside legality, honnêteté alongside charity, and “sublime” self-love alongside ordinary human selfishness. More fundamentally, it also fitted into the type of claim about the relationship between the passions and the arts that could be found in the works of Jean-Baptiste Dubos or Voltaire, and of how, in conjunction, they could keep morality alive. For Rousseau, the alternative to “the masterpiece of politics of our century” involved a rather limited array of individual interests and relied heavily on the part played by public opinion in shaping social behaviour. With these in place, self-interest and the common interest would coincide, without requiring any further motivation to be supplied by benevolence or altruism.