 The PJP can also specify which social processes establish public justification. We can sort social processes into four types: discursive, universalizing, bargaining, and evolutionary. Discursive views identify public justification with an agreement reached between public discussants. Universalizing approaches identify public justification with fair and reciprocal principles. Bargaining approaches identify publicly justified principles as those that maximally advance individual interests. Evolutionary approaches are the most distinctive. They distinguish sharply between public reason and public justification. In their view, a coercive principle \(L\) is publicly justified when it is a stable, evolved public equilibrium. No process of public reasoning needs to take place. These four theories each have a prominent representative. In order they are Jürgen Habermas, John Rawls, David Gauthier and Gerald Gaus.