Um, did i just get mansplained compound interest by Paul f*ing Graham? I feel like this has been the subject of condescending advice since the beginning of time.

"But now you at least understand, from having done the math yourselves, that you don't have to cheat to become a billionaire. You've seen for yourselves that there are only two numbers in the calculation, the growth rate and how long it continues."

What could possibly be false in a two-parameter model of reality?