Can you please elaborate on "downward pressure". Because the way I see it, 4day work week should actually increase the salaries, not reduce it. The way I see - if there is work for 3200 hrs. - it could either be done by one person in 80 weeks (current setup), OR 100 weeks in new setup. Assuming next that velocity should remain the same to keep competitiveness, it's gonna require you to hire not 0.25, but probably 0.5 person for one day free. Hence demand increase for employees. No?

Businesses will seek to pay less for less days worked whilst still expecting the same throughput.

If they are not getting the same throughput why would they support this change?

Until you realize more and more of your stuff are not just Chinese made, but Chinese branded, by those 996 manufacturers.

I am not sure how this pertains to my comment

Unions and labor regulations are important components of arriving at the desired outcome. You have to keep pulling the policy ratchets to reduce the work week and bolster worker protections, otherwise capitalism will extract until there is nothing left.

Good thing that so many white collar jobs are unionized then /s