Bitcoin Miners: A Study in Volatility squib

The one- and three-year stock returns speak for themselves -- some bitcoin miners are surging while others aren't doing so well. As a point of reference, the S&P 500 (SNPINDEX: ^GSPC) market index rose 27% in 2020 and 90% over the past three full calendar years. Beta values measure how tightly a security's price moves correlate with a market index, typically the S&P 500.
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