Work, even at 40 hours per week, can over time be so detrimental to health, that 20 hours per week ought to be the sane default. It would allow enough time for a healthy lifestyle with a proper diet and plenty of exercise. If everyone did it, I would be okay with the corresponding 50% reduction in pay. Moreover, this could allow for more capitalism, not less, as people could use their spare time, if any, to work on their own innovative projects.