The trials lack a randomized control group and most participating firms have no objective productivity metric; lead researcher Juliet Schor characterized the results as self-reports of companies saying the innovation is working, and economists noted that the implied overnight productivity jumps are implausibly large.

Evidence (1)

4-day workweek productivity claims gather criticism (TechTarget)

No control group; productivity poorly measured; Schor calls results self-reports; Dean Baker calls a 25% overnight productivity jump 'impossibly great'; Hamermesh finds four-day workers earn less for the same hours, suggesting a productivity hit.

https://www.techtarget.com/searchhrsoftware/news/252525395/Four-day-workweek-productivity-claims-gather-criticism

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