I believe the calculation is for when the system approached its new steady state. And why shouldn&#x27;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.<p>Plus it&#x27;s not like we&#x27;d see no improvement whatsoever for 49 years and then WHAM. We&#x27;d see gradual returns on this investment every year.