I too would be interested in sources for this assertion. It goes contrary to what I would say if I were asked to guess about classes of today compared to classes of fifty years ago.

edit: Oops, I should have refreshed page before commenting, as I now see Vladimir_M responded. Leaving comment for content about my state of mind on this issue.

Do you have a citation?

No, it's a conclusion from common sense and observation, though I could find all kinds of easily cited corroboration. Unfortunately, as I said, a more detailed analysis of these trends and their components and causes would get us far into various controversial and politicized topics, which are probably best left alone here. I stated these opinions only because they seemed pertinent to the topic of the original post and the subsequent comments, i.e. the reasons for broad dissatisfaction with life in today's developed world, and their specific relation to the issues of work.