"He and Ms. Landemore suggest that reasoned discussion works best in smaller, cooperative environments rather than in America’s high-decibel adversarial system, in which partisans seek to score political advantage rather than arrive at consensus. Because “individual reasoning mechanisms work best when used to produce and evaluate arguments during a public deliberation,” Mr. Mercier and Ms. Landemore, as a practical matter, endorse the theory of deliberative democracy, an approach that arose in the 1980s, which envisions cooperative town-hall-style deliberations. Championed by the philosophers John Rawls and Jürgen Habermas, this sort of collaborative forum can overcome the tendency of groups to polarize at the extremes and deadlock, Ms. Landemore and Mr. Mercier said."