Most people are not salaried knowledge workers. A hairdresser's hourly productivity doesn't increase if he works 6 hours instead of 8. A cashier's throughput wont increase notably if she only works 6 hours a day, and there's no effective means for that type of worker to "fit" 8 hours of work into a 6 hour day.
What do you do with these people? Do you increase the minimum wage to something more inflation adjusted (upwards of $20/hr). Do you just cut their hours and be done with it? What do you do about the staffing shortages that a 30hr work week would create?
Retailers in the UK prefer to hire part time staff because it gives them more resilience. One person off sick is less of a problem when you have 10 staff vs 5.
What do you do with these people? Do you increase the minimum wage to something more inflation adjusted (upwards of $20/hr). Do you just cut their hours and be done with it? What do you do about the staffing shortages that a 30hr work week would create?