I was curious for context on this, and honestly didn't find much in my brief search, but apparently it's thought that for professionals, the hours worked has go

I was curious for context on this, and honestly didn't find much in my brief search, but apparently it's thought that for professionals, the hours worked has gone up, while for the working class, it has gone down. I didn't research it, but I wonder if part of the explanation is that working class people tend to be under-employed, and/or government policies that kick in at say, 30 hours / week (like the ACA, for example) push the numbers down. Professionals of course tend to be salaried, so you really want to squeeze out as much as you can.