ShowerThoughts

Yes, and growth is sustained by striking a balance of quality and quantity in terms of the human population. If this balance becomes out of whack you will decline into what they refer to as "malthusian stagnation". So the population does need to grow in order to sustain economic growth, along with the quality of the individuals that make up the population. What they refer to as "economic darwinism" beings to truly take place as a population has the extra resources to put more into children than parent, creating generational progress. Post industrial economic darwinism gets a buffer, so-to-speak, due to the increased per capita productivity introduced by technology. However this is also not infinite, and so, at some point this will plateau, and the population will need to begin rising again to spur growth. We are likely in the midst of this plateauing.