Comment by jaggirs

I guess to truly calculate it you need to estimate how long it will take to get the ROI (i.e. reach the point where you need to pay taxes on the 150billion). And add back what you can earn by investing the money you didn't have to pay taxes on. I'm not sure what the magnificent 7 can expect as a ROI on invested money though, given that they tend to have enough cash to invest anyways and just pay out dividends.