This paper tests the assumption that evaluators are biased to positively evaluate high status individuals, irrespective of quality. Using unique data from Major League Baseball umpires’ evaluation of pitch quality, which allow us to observe the difference in a pitch’s objective quality and in its perceived quality as judged by the umpire, we show that umpires are more likely to over-recognize q...

This paper provides an introductory review of the theory of judgment aggregation. It introduces the paradoxes of majority voting that originally motivated the …eld, explains several key results on the impossibility of propositionwise judgment aggregation, presents a pedagogical proof of one of those results, discusses escape routes from the impossibility and relates judgment aggregation to some...

The paper proposes a unification of the two main frameworks commonly used for the analysis of collective decision-making: the framework of preference aggregation, developed from the seminal work of K. Arrow on social choice theory; and the more recent framework of judgment aggregation. Such unification provides several original insights on collective decision-making problems. The methods used a...

This introduces the symposium on judgment aggregation. The theory of judgment aggregation asks how several individuals’judgments on some logically connected propositions can be aggregated into consistent collective judgments. The aim of this introduction is to show how ideas from the familiar theory of preference aggregation can be extended to this more general case. We …rst translate a proof o...