Bitcoin's drop renews risk concerns

The debate over Bitcoin and other cryptocurrencies took on a new dimension last month when Fidelity Investments, one of the world’s largest asset managers, announced that it would soon allow participants in its 401(k) plans to invest some of their retirement savings in Bitcoin. Last Wednesday, that led Sens. Elizabeth Warren, D-Mass., and Tina Smith, D-Minn., to send Fidelity a letter challenging the decision. Ben Schreckinger reports.

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