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All speculative market manias produce signature characters. From the Yale economist Irving Fisher, who, in October, 1929, pronounced that stock prices had reached âwhat looks like a permanently high plateau,â to Charles Prince, the chief executive of Citigroup, who, in July, 2007, remarked, âAs long as the music is playing, youâve got to get up and dance,â these individuals are forever tied to the bubbles they got caught up in. When the story of bitcoin is written, there will be many crypto boosters to choose from, such as the Winklevoss twins; the hedge-fund manager Paul Tudor Jones; and Cathie Wood, a pioneer of funds devoted to investing in disruptive companies. Right now, though, the individual most clearly associated with bitcoinâs travails is Elon Musk, the C.E.O. of Tesla and SpaceX.