Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
A group of n experts has to pick one winner from a group of candidates. Each expert has a judgment about who is the best candidate. A social choice rule (SCR) is a function that aggregates experts’ judgments to determine the deserving winner. Experts may be biased and not want to reveal their judgments. We state a necessary and sufficient condition for implementing an SCR in dominant strategies. We show that no q-supermajoritarian SCR with q≤n−1 or q-submajoritarian SCR with q≥2 satisfies this condition.