Front Page Titles (by Subject) I.: Introduction - The Collected Works of James M. Buchanan, Vol. 10 (The Reason of Rules: Constitutional Political Economy)
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I.: Introduction - Geoffrey Brennan, The Collected Works of James M. Buchanan, Vol. 10 (The Reason of Rules: Constitutional Political Economy) 
The Collected Works of James M. Buchanan, Vol. 10 (The Reason of Rules: Constitutional Political Economy) Foreword by Robert D. Tollison (Indianapolis: Liberty Fund, 1999).
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We have discussed the private-choice calculus of the individual in some detail because the analysis is helpful in introducing the more complex calculus of the individual confronting the public- or social-choice setting. In order to reduce the discussion to manageable proportions, we shall ignore several of the complexities that arise. We shall continue to neglect strategic behavior. The individual in a public-choice setting is one among many and can rationally treat the behavior of all others as if it were part of the environment and hence not subject to manipulation. We also continue to concentrate on the choice calculus of a single reference individual. We neglect problems involved in securing agreement among persons, although, as the argument will suggest, the operation of the rules for making arrangements may modify the individual’s choice behavior. We presume that the individual will behave in the many-person collective-choice setting as if he pursues his own interests as they are reflected in the underlying utility function.
One reason for the detailed elaboration of private-choice behavior in Part 1 was to suggest that in several respects, the private- and public-choice settings are similar. We can summarize the earlier analysis as follows: A person faces a choice at t0, a choice that will be constrained by choices made in prior periods; this choice will be informed by the influence that behavior in t0 is anticipated to exert on choices made in t1 and beyond. The person in t1 and beyond is, in part, constructed by choices made in t0 and earlier, but at the same time the person in t1 and beyond must be different from the one who must act in t0. In this setting, the individual chooses among the Z’s in t0; the individual may adopt moral rules; the individual may precommit future choices—all of these actions are designed to further the achievement of a preferred life plan.