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Tony Noerpel

Hi Dave

I don't wish to argue either but Tom Murphy a physicist on his bloghttp://physics.ucsd.edu/do-the-math/2013/09/the-real-population-problem/
observes that population growth rate as a function of per capita GDP is U shaped. It is low for the middle class but high for the poor and the wealthy. This trend if true may have the effect of increasing the growth rate as more people become poorer. On the other hand hard to extrapolate into a future we've never before experienced.


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