Trial and Error: Decision Reversal and Panel Size in State Courts

Using cross-state and within-court variation, I show that lower court decisions are reversed more frequently by larger, rather than smaller, panels of high court judges. Overall, conditional on being reviewed, the probability that a case is reversed by a high court judicial panel is less than one half. To understand these findings, I develop a simple framework that connects reversals and panel size with the extent to which judicial decision-making is congruent with the law. Assuming the high court rules correctly more often than not, my empirical results suggest that increasing judicial panel size erodes the quality of decision-making in high courts. These results are consistent with a large literature investigating small group size effects on productivity and output. (JEL D02, D71, H41, K40)