Greenspan put

Monetary policy tool

The Greenspan put was a monetary policy response to financial crises that Alan Greenspan, former chair of the Federal Reserve, exercised beginning with the crash of 1987. Successful in addressing various crises, it became controversial as it led to periods of extreme speculation led by Wall Street investment banks overusing the put's repurchase agreements and creating successive asset price bubbles. The banks so overused Greenspan's tools that their compromised solvency in the 2007–2008 financial crisis required Fed chair Ben Bernanke to use direct quantitative easing. The term Yellen put was used to refer to Fed chair Janet Yellen's policy of perpetual monetary looseness.

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