Well if that was truly the offer then always take the $1 - there wasn't a contingency on the doubling and more than there was on getting the $1,000,000. After 20 days you'd have a million, after another a million million - which I believe is a trillion. Of course eventually you run out of markets to find more money so you have to assume the double your money every day is bogus. But like I said, that wasn't the deal.

But even if you only did it once every two weeks - that's still a million a year. Take $999,999 - spend, enjoy - take the remaining $1 and rinse and repeat. Puts you pretty much in the top 0.1% of earners with zero effort (just for comparison).