 Evolutionary views draw on “adaptive” rationality, contrasted with “calculated” rationality (March 1978). An agent is rational when she adapts effectively to her environment, so her rationality does not depend on how she adapts, only that she adapts well. Calculated rationality occurs when one adapts through deliberative decision-making. Many theorists assume the PJP is a principle of calculative reason. But evolutionary theorists reject this claim. \(L\) is publicly justified for \(P\) if each member has sufficient reason to endorse \(L\). Full stop. Public justification obtains even if justificatory reasons differ. It even obtains when these reasons are the consequence of an equilibrium process. The reasons need not derive from explicit deliberation.