This math is way off. _Guaranteed_ doubling in 4 years is a 19% per annum return. If the "not doubling" case is "break even" (generous) then the expected growth

This math is way off. _Guaranteed_ doubling in 4 years is a 19% per annum return. If the "not doubling" case is "break even" (generous) then the expected growth is under 10% per annum.