Stone Age

In the Stone Age, everything was about survival. The tall saber-toothed elephant, the ferocious South China tiger, the huge brown bear, the galloping rhinoceros, and the diving giant crocodile were all targets of hunting. What was the most expensive thing in the Stone Age? Population. Want a bow and arrow? Yes, in exchange for population. Want pottery? Yes, in exchange for population. Want some salt? Yes, in exchange for population.