Also most of the work we do is to bid against each other for land. If we all worked 45 hours a week the extra 5 would go into land costs, we'd all have the same

Also most of the work we do is to bid against each other for land. If we all worked 45 hours a week the extra 5 would go into land costs, we'd all have the same house, and land speculators and usurers would have slightly bigger yachts. Given the huge ramp in productivity on necessary work, we could easily slack off some and see our living standards unaffected.