If your account of democratic authority uses the term “epistemic” then sooner or later you’re going to have to deal with the Jury Theorem. And here is where David takes up the gauntlet.
I’ve made that seem rather dramatic, but by this point in the book the gauntlet isn’t especially heavy! After all, in preceding chapters we’ve seen a model form of deliberation, a distinction between formal and substantive epistemic value, and a careful distinction between a “test” for finding the correct answer to some shared problem (such as majority rule), and a “testing system” (such as a constitutional democracy within which majoritarian decision procedures are embedded). The Jury Theorem, as tantalizing as it may be to some democratic theorists, does not appeal to discussion and argument, relies on claims about voter competence and the substantive correctness of some choices, and it applies in the first instance to specific tests (voting and majority or plurality rule), not to a testing system per se.
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