If you want to become a millionaire, you just need to buy 1 BTC! If you want to become a billionaire, you just need to buy 10 BTC! Based on the current 19.9 million mined Bitcoins, subtract an estimated 5 million lost Bitcoins, then subtract 4.1 million held by institutions, and assume long-term individual investors are 'hodling' about 3.8 million, we can estimate that the actual free-floating supply of Bitcoin available for trading in the market might only be 7 million. With 8 billion people worldwide, that’s an average of just 0.000875 BTC per person.