# The Calculus of Consent

The Calculus of Consent: Logical Foundations of Constitutional Democracy is a book written by economists James M. Buchanan and Gordon Tullock in 1962. It is considered to be one of the classic works from the discipline of public choice in economics and political science. This work presents the basic principles of public choice theory.

## Quotes
### 1. Introduction

* Any theory of collective choice must attempt to explain or to describe the means through which conflicting interests are reconciled. In a genuine sense, economic theory is also a theory of collective choice, and, as such, provides us with an explanation of how separate individual interests are reconciled through the mechanism of trade or exchange.
* The theory of collective choice can, at best, allow us to make some very rudimentary predictions concerning the structural characteristics of group decisions.
* When we recognize that "constitutional" decisions themselves, which are necessarily collective, may also be reached under any of several decision-making rules, the same issue is confronted all over again. Moreover, in postulating a decision-making rule for constitutional choices, we face the same problem when we ask: How is the rule itself chosen?
* It is to be emphasized that, in this constitutional discussion, the prospective utility of the individual participant must be more broadly conceived than in the collective-choice process that takes place within defined rules.

### 2. The Individualistic Postulate

* A theory of collective choice must be grounded on some assumption concerning the nature of the collective unit.
* The class-dominance approach to political activity is acutely related to our own in an unfortunate terminological sense. By historical accident, the class-dominance conception, in its Marxian variant, has come to be known as the "economic" conception or interpretation of State activity.

### 3. Politics and the Economic Nexus

* Our purpose in this book is to derive a preliminary theory of coUectivechoice that is in some respects analogous to the orthodox economic theory of markets. The latter is useful for predictive purposes only to the extent that the individual participant, in the market relationship, is guided by economic interest.
* It is also necessary to emphasize that economic theory does not try to explain all human behavior, even all of that which might be called "economic" in some normally accepted sense of this term. At best, the theory explains only one important part of human activity in this sphere.
* Reduced to its barest essentials, the economic assumption is simply that the representative or the average individual, when confronted with real choice in exchange, will choose "more" rather than "less."
* Both the economic relation and the political relation represent cooperation on the part of two or more individuals. The market and the State are both devices through which co-operation is organized and made possible. Men co-operate through exchange of goods and services in organized markets, and such co-operation implies mutual gain. The individual enters into an exchange relationship in which he furthers his own interest by providing some product or service that is of direct benefit to the individual on the other side of the transaction. At base, political or collective action under the individualistic view of the State is much the same. Two or more individuals find it mutually advantageous to join forces to accomplish certain common purposes. In a very real sense, they "exchange" inputs in the securing of the commonly shared output.
* An individualist theory of collective choice implies, almost automatically, that the basic decision-making rules be re-examined in the light of the changing role assumed by government. There should be little reason to expect that constitutional rules developed in application to the passage of general legislation would provide an appropriate framework for the enactment of legislation that has differential or discriminatory impact on separate groups of citizens.
* Superficially, the power-maximizer in the collective-choice process and the utility-maximizer in the market process may seem to be country cousins, and a theory of collective choice based on the power-maximization hypothesis may appear to be closely related to that which we hope to develop in this essay. Such an inference would be quite misleading. The two approaches are different in a fundamental philosophical sense.
* The most effective way of illustrating the distinction between the individualist-economic approach and economic determinism or the class approach (a distinction that is vital to our purpose in forestalling uninformed criticism) is to repeat that the first approach may be used to develop a theory of constitutions, even on the restrictive assumption that individuals are equivalent in all external characteristics.

## Quotes about The Calculus of Consent

* Tullock and I considered ourselves to be simply taking the tools of economics, looking at something like the structure of American politics in the way James Madison had envisioned it. That is, it was clearly not a majoritarian democracy, which would be the parliamentary model (which was the ideal, at that time especially, of all the political scientists), rather it was a sort of a constitutional structure. We were the first to start analyzing the Constitution from an economic point of view. There were other people who analyzed particular voting rules, like majority voting, but we put that in a constitutional structure and provided an argument for choices among voting rules. We concentrated on that. So, in a sense, I considered us to be simply writing out in modern economic terms more or less Madison's framework of what he wanted to do, as opposed to anything new and different. It turned out that nobody had looked at it in that way.
** James M. Buchanan, "Interview with James Buchanan" in The Region (September 1995)