BS. Per person GDP did not grow 30+ fold.<p>A hunter gather lifestyle from 10,000 years ago takes ~0.5-5$&#x2F;day in food assuming everything else [ed: produced 10,000 years ago] has zero value.  US Per capita GDP = ~125$ &#x2F; day.  Actual growth per year is on the order of 0.04% &#x2F; year<p>PS: Remember meat more than 1$&#x2F;lb.  For much of human history per capita GDP by todays measurements was actually dropping.