Until bitcoin's invention, all forms of money were unlimited in their quantity and thus imperfect in their ability to store value across time. Bitcoin's immutable monetary supply makes it the best medium to store the value produced from the limited human time, thus making it arguably the best store of value humanity has ever invented. To put it differently, bitcoin is the cheapest way to buy the future, because bitcoin is the only medium guaranteed to not be debased, no matter how much its value rises.