Productivity is not the only concern, individual preference should also be accounted for. Someone might want to sacrifice 10 hours a week for 20 % less pay for

Productivity is not the only concern, individual preference should also be accounted for. Someone might want to sacrifice 10 hours a week for 20 % less pay for instance (productivity vs hours worked is more than likely not linear). People should be more free to negotiate such arrangements. Basic income could give them the leverage needed to have a stronger negotiating position - right now employers usually have a way stronger hand.