The state of nature in the shadow of contract formation: Adding a missing link to J.M. Buchanan's social contract theory

The social contract theory of J.M. Buchanan provides no clear-cut answer on the question which one of the multitude of possible Pareto-efficient contracts is chosen by individuals who shape a contract in an (imaginary) state of nature. This deficiency is remedied in this paper by adding the Nash-bargaining theory. It seems to be in line with at least part of Buchanan's reasoning. Whereas for Buchanan the configuration of contract depends unilaterally on the natural equilibrium of the state of nature, we are able to show that the parties' (rational) contractual expectations have repercussions for their behavior in the state of nature. That is why the location of the natural equilibrium proves to be heavily dependent on the chosen bargaining theory. The implication is that assessing the legitimacy of a given constitutional order or contract (on the basis of the natural equilibrium) depends on the particular bargaining theory chosen to solve the underlying constitutional distribution problem. I am grateful to D. Andrews, D. Schmidtchen and U. Witt for helpful comments on earlier drafts. The usual caveat applies.