America's top banker says we can't prevent economic bubbles, only contain the damage

In fact, Yellen questioned whether this tactic, long held to be the central banks' primary method for constraining an overeager market, actually worked at all."Monetary policy faces significant limitations as a tool to promote financial stability," Yellen told an audience at an event put on by the International Monetary Fund. "Monetary policy faces significant limitations as a tool to promote financial stability."

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