In the experiments, there are two options, exactly one of which is designated correct, and voters are given the task of voting for the correct option using impe

In the experiments, there are two options, exactly one of which is designated correct, and voters are given the task of voting for the correct option using imperfect information as to which one that is. "Underperforms" then means that the correct option is chosen less often. (If you want a more precise mathematical statement, the explanation of the model starts on page 8.) Basically, the model subscribes to the "mistake theory" of political disagreement ( https://old.reddit.com/r/slatestarcodex/comments/74vpwm/socialism_communism_and_marxism_pt_1_on_trust_and/ https://old.reddit.com/r/slatestarcodex/comments/74vpwm/soci... ) that there is a single outcome that's best for everyone and disagreements only happen because sometimes people are mistaken as to which outcome that is. In a "conflict-theoretical" experiment where voters are trying to maximize their benefit even at the expense of others, I suspect people would do quite well at identifying a member of their own tribe to delegate their vote to.