Here we are talking about the fact that "more productivity" is not linearly proportional to "more hours spent". Rather, more hours you spent working (over a cer

Here we are talking about the fact that "more productivity" is not linearly proportional to "more hours spent". Rather, more hours you spent working (over a certain limit), less is your productivity. And more days you spend these more-hours, far less you will be productive. In the end the psychologist want to stress the fact that working 80 hours is EQUAL productive to working 40-45, already in the short term! (and they get LESS productive in the mid-long term) With the difference that working the right amount of hours do not cause burn-out and illness. Again, with a good management capable of understand this, those successful companies would be equal successful today BUT without causing so much pain to their employees back in the days.