Unlikely sabotage: Comment on Bloomfield, Marvão, and Spagnolo

Bloomfield, Marvão, and Spagnolo (2023) establish an interesting yet puzzling finding: Firms in concentrated industries that form cartels are more likely to use relative performance evaluation (RPE) compensation arrangements for their top managers. The paper interprets this as evidence that cartel members constrain managers' incentives to engage in costly sabotage when their compensation depends on their peer firms' performance. I argue that successful costly sabotage to gain an RPE advantage is extremely unlikely and that costly sabotage is more likely among cartel firms than non-cartel firms. It therefore is an unlikely explanation of the paper's main finding. I propose an alternative explanation, that RPE benchmarks include firms that are not cartel member firms.