> But instead, we have billions of people now, and it was at least 2000 years ago that we reached 100 million. When you have that many people, although most of them are still working on the basics (growing food, building housing, etc.), in absolute terms there can be millions of people working on specialized tasks.

Now let's imagine what happens when AI and machines step in and completely take over the menial jobs. The redistribution to cognitive task occupation will deliver another technological revolution.