I believe the calculation is for when the system approached its new steady state. And why shouldn't one care about the world of fifty years from now? I intend t

I believe the calculation is for when the system approached its new steady state. And why shouldn't one care about the world of fifty years from now? I intend to still be alive, and so will a lot of the people I care about. Plus it's not like we'd see no improvement whatsoever for 49 years and then WHAM. We'd see gradual returns on this investment every year.