The price of bitcoin dropped another 10 percent Tuesday, extending a decline that has sent the virtual currency down 33 percent in the past month and 46 percent in the past year. Boom and bust cycles are par for the course for bitcoin. So far this year, there have been only three days where the S&P 500-stock index dropped more than 3 percent, with the worst being a 4 percent drop in February, says Duke University finance professor Campbell R. Harvey.
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