> This assumes that productivity is constant per hour worked, which is far from the truth for many professions. It isn't, but productivity also isn't an invers

> This assumes that productivity is constant per hour worked, which is far from the truth for many professions. It isn't, but productivity also isn't an inverse function of number of hours worked. At best, productivity is a function of the incentives which drives you, to a limit, after which it comes down for the number of hours worked. Take for example there are many people who had high paying corporate job, but once they quit it and started working on their own startup, despite the long hours they worked, their productivity went up. Similarly, other people work for money, because that's what drives them. The main point is that there is no one size fits all solution. But nearly all these studies about workplace hours studies fail to see that.