This is an electronic version of anNuffield College in 1998, and Dryzek thanks the College for its hospitality. For helpful comments, we thank Keith Dowding, James Fishkin, Natalie Gold, Robert Goodin, Iain McLean, Gerry Mackie, David Miller, Claus Offe, Anne Sliwka, the editor, and the anonymous reviewers of this paper.2
Social Choice Theory and Deliberative Democracy:A Reconciliation
AbstractThe two most influential traditions of contemporary theorizing about democracy, social choice theory and deliberative democracy, are generally thought to be at loggerheads, in that the former demonstrates the impossibility, instability or meaninglessness of the rational collective outcomes sought by the latter. We argue that the two traditions can be reconciled.After expounding the central Arrow and Gibbard-Satterthwaite impossibility results, we reassess their implications, identifying the conditions under which meaningful democratic decision making is possible. We argue that deliberation can promote these conditions, and hence that social choice theory suggests not that democratic decision making is impossible, but rather that democracy must have a deliberative aspect.
Two Traditions of Democratic TheoryIn the past decade the theory of democracy has been dominated by two very different approaches. Within democratic theory as conventionally defined the strongest current is now deliberative. 1 For deliberative democrats, the essence of democratic legitimacy is the capacity of those affected by a collective decision to deliberate in the production of that decision. Deliberation involves discussion in which individuals are amenable to scrutinizing and changing their preferences in light of persuasion (but not manipulation, deception, or coercion) from other participants. Claims for and against courses of action must be justified to others in terms they can accept. Jürgen Habermas and John Rawls, respectively the most influential continental and Anglo-American political philosophers of the late 20 th century, have both identified themselves as deliberative democrats. 2 Deliberative democrats are uniformly optimistic that deliberation yields rational collective outcomes.The main competing tradition is social choice theory, whose proponents generally deduce far less optimistic results. To social choice theorists, the democratic problem involves aggregation of views, interests, or preferences across individuals, not deliberation over their content. From the seminal work of Kenneth Arrow on, it has been argued that such aggregation is bedeviled by impossibility, instability and arbitrariness. 3 Arrow proved the non-existence of any aggregation mechanism satisfying a set of seemingly innocuous conditions. This critique of democracy was radicalized by William Riker, who argued that any notion of a popular will independent of the mechanism used to aggregate preferences was untenable. 4 Given that there is no good reason to choose any particular mechanism over any other, supposedly democratic collective choices are arbitrary, and dem...