Havent had a chance to read all, but most if not all of these studies likely apply to averages, so don't overstate this 40 hour snippet. In other words, the individual with average capabilities and motivation may be able to work 40. People may vary significantly off the median.
exactly. there are superhuman freaks of nature: albert pujols and michael phelps come to mind. in addition, this study necessarily discounts the contribution of those that have actually changed entire industries. a single person might have one hour of production that creates a huge amount of wealth, maybe the ten years of research that culminates in a solution that, to get hyperbolic, changes everything. i think the key take away here is to not force people to work more than that want and need to.
