Comment by sokoloff

Isn’t this “healthy, large middle class” a reality that is less than 100 years old in the best of cases? (After a smaller initial emergence perhaps 100 years prior to that.) In 250K years since modern humans emerged, that’s a comparative blink of an eye.

There might be slight local dips along the timeline, but I think most Westerners (and maybe most people, but my lived experience is Western) would not willingly trade places with their same-percentile positioned selves from 100, 200, 500, 1000, 2000, 10K, 50K, or 250K years ago. The fact that few would choose to switch has to be viewed with some positive coefficient in a reasonable success metric.