Opinion: The bitcoin bubble is a bad omen for the US economy

http://ift.tt/1xQ7ItR I have written about bitcoin BTCUSD, -0.56% being a bubble in the past couple of weeks, I have not clearly defined what a bubble actually is. The key is a rapid surge in market capitalization — the number of shares times the share price — and what that capitalization discounts. The value of a ...

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