When looking at the two streams of research these men produced, it is tempting to characterize Buchanan as a somewhat romantic optimist holding the belief that the pursuits of selfish individuals can be channeled for the common good, if the right set of constitutional constraints are adopted, and believing that individuals are capable of designing constitutions that achieve this goal. Thus, some 35 years after the publication of The Calculus, we find Buchanan, in joint work with Roger Congleton (1998), accepting the fact that legislatures always will adopt the simple majority rule, and trying to design constitutional constraints that will lead to outcomes benefiting all members of the community under that rule.

James Buchanan, Gordon Tullock, and The Calculus (2012)