Abstract
This chapter defends an epistemic argument for democracy, namely the argument that the rule of the many is better at aggregating knowledge and, in the version presented here, at producing better decisions than the rule of the few. This argument builds on the formal properties of two key democratic decision-making mechanisms of democracy, namely inclusive deliberation on equal grounds and majority rule with universal suffrage. Properly used in sequence and under the right conditions, these two mechanisms ensure that no information and viewpoint is ignored and maximize the cognitive diversity brought to bear on collective political problems and predictions. Building on existing formal results by Lu Hong and Scott Page, the chapter introduces the “Number Trumps Ability” theorem, which formalizes the intuition that many minds are smarter than just a few. Under the right conditions systems governed by democratic decision-procedures can be expected to deliver greater epistemic performance than less inclusive and egalitarian systems.
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