Could you kind of summarize a little bit of what that was about? Because that sounded interesting.

So way back... middle of the 1800s, when they first were keeping a little bit of records on this, the average length of the work week in the U.S. was about 70 hours.

And you got Sunday off because they respected that.

So that's working a lot of hours, six days a week.

And then it slowly came down and came down.

And so what I did in my dissertation was, you know, bring together statistics on that, but then also try to figure out what were the main driving forces behind it.

And like almost everything in economics, it boils down to supply and demand.

Why is it important for economists to pay attention to falling birth rates? And what are the economic consequences of this, do you think?