[peter303]

A variant is start with one penny a day and increase by one penny each day. People are adults by 10,000 days, middle age by 20,000 and die around 30,000. The accumulated amount is triangle numbers of days, or the day count squared, then halved. That would be a half million (10K^2/200), 2 million and 4.5 million dollars respectively for these 10K-round numbers. These are actually feasible investment amounts.

[huxley]

Investing a surplus $100-200 a day everyday of your adult life may stretch the definition of feasible for most people.

But on the positive side, the amount didn't double every day or you'd seriously distort the stock market in a matter of weeks.