 A second common epistemic justification for democracy—which is often traced to Aristotle (Politics, Book II, Ch. 11; see Waldron 1995)—argues that democratic procedures are best able to exploit the underlying cognitive diversity of large groups of citizens to solve collective problems. Since democracy brings a lot of people into the process of decision making, it can take advantage of many sources of information and perspectives in assessing proposed laws and policies. More recently, Hélène Landemore (2013) has drawn on the “diversity-trumps-ability” theorem of Scott Page and Lu Hong (Hong &amp; Page 2004; Page 2007)—which states that a random collection of agents drawn from a large set of limited-ability agents typically outperforms a collection of the very best agents from that same set—to argue that democracy can be expected to produce better decisions than rule by experts. Both Page and Hong’s original theorem and Landemore’s use of it to justify democracy are subject to dispute (see Quirk 2014; Brennan 2014; Thompson 2014; Bajaj 2014).