Civilization 1.0, 2.0 and 3.0
Human history divides into three phase changes: hunter-gatherer life (1.0), agricultural society (2.0) and, from roughly the 18th-century British Industrial Revolution, the fusion of modern science with free-market economies (3.0). In 1.0 and 2.0, output per person barely rose over millennia because any surplus was absorbed by population growth or taken by force. In 3.0, per-capita output compounds for the first time, at roughly 2–3% a year, sustained over centuries.