I'm still trying to find the time to complete Piketty's Capital, but one thing that I was surprised to learn from it thus far is that global population growth h

I'm still trying to find the time to complete Piketty's Capital, but one thing that I was surprised to learn from it thus far is that global population growth has a much greater impact on GDP growth than you might think. I'm loath to leave a comment like this without citing some of his data (not at my disposal, atm) but if I recall correctly, it's like more than half of GDP growth (roughly). As global population growth slows, and it is, invariably economic growth is going to slow down. It sounds like a common sense thing, but the numbers Piketty put on it were very surprising.