This may be a no-brainer, but really. We work more hours than the prehistoric man hunted. We work in artificial environments that stretches our social/family ties, the prehistoric man did all his activities with the involvement of his social/family environment. The prehistoric man was "separated" from the animal kingdom by inventing that the weakest member of his horde was worth enough to support, we eagerly write off everybody who is not competitive enough.
And what do we gain for these sacrifices? We can drive more expensive cars to take an even remoter job. We can buy more expensive houses that we hardly have any time to spend in. We can get hefty investment account balances that evaporate in one swoop at any stock market/credit dip/crash or at any structural unemployment experience. What is the difference between slavery and controlling the prices of all trades by cornering the markets? They teach in school that slavery was the step-ahead that advanced civilization out of the prehistoric age. But was it really a progression or a regression? Is our world today a progression?