A systematic review of the academic literature found the popular claims often trace to advocacy-group and self-reported reports rather than scholarly research, and that the impact on productivity was inconclusive.

Evidence (1)

The four-day work week: a systematic review (Management Review Quarterly)

Review of 31 academic articles; favourable on morale/satisfaction/turnover but found productivity and environmental impact inconclusive, and flagged advocacy-sourced claims.

https://link.springer.com/article/10.1007/s11301-023-00347-3

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