In a world of structural demographic compression and labor shortages popping up, I'm unsure if this assertion is accurate. As labor supply contracts while demand remains constant (or increases, due to aging non prime workers who consume without producing), labor leverage to move to a 4 day week increases.

Today, ~1600 school districts across 24 states in the US are on 4 day weeks to attempt to retain teachers, for example.

https://www.aei.org/research-products/working-paper/world-de...

https://www.bloomberg.com/news/articles/2024-09-18/us-faces-... | https://archive.today/Lyr5t

https://www.axios.com/2023/05/08/us-labor-shortage-older-wor...

https://www.nber.org/system/files/working_papers/w26633/w266...

https://www.apa.org/monitor/2025/01/rise-of-4-day-workweek

https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...