The Japanese birth rate dropped, due to its emphasis on work to rebuild the country and then their social safety net made it too expensive to have children.
From what I understand, from people who understand Japan. It isn’t so much that they do as much work at the office that should be done in their workday. There is a lot of time at the office simply being wasted, because they have to impress the boss by being there all the time. They don’t necessarily do more work than the average American office worker.
“The Japanese birth rate dropped”
“Japan uses more Depends than Pampers” is a saying in Japan.