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- 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 (or indirect quantitative easing) and creating successive asset price bubbles. The banks so overused Greenspan's tools that their compromised solvency in the global financial crisis of 2007–2008 required Fed chair Ben Bernanke to use direct quantitative easing (the Bernanke put). The term Yellen put was used to refer to Fed chair Janet Yellen's policy of perpetual monetary looseness (i.e. low interest rates and continual quantitative easing). In Q4 2019, Fed chair Jerome Powell recreated the Greenspan put by providing repurchase agreements to Wall Street investment banks as a way to boost falling asset prices; in 2020, to combat the financial effects of the COVID-19 pandemic, Powell re-introduced the Bernanke put with direct quantitative easing to boost asset prices. In November 2020, Bloomberg noted the Powell put was stronger than both the Greenspan put or the Bernanke put, while Time noted the scale of Powell's monetary intervention in 2020 and the tolerance of multiple asset bubbles as a side-effect of such intervention, "is changing the Fed forever." While the specific individual tools have varied between each genre of "put", collectively they are often referred to as the Fed put. In late 2014, concern grew about the emergence of a so-called everything bubble due to overuse of the Fed put and perceived simultaneous pricing bubbles in most major US asset classes. By late 2020, under Powell's chair the perceived everything bubble had reached an extreme level due to unprecedented monetary looseness by the Fed, which simultaneously sent most major US asset classes (i.e. equities, bonds, housing, and commodities) to prior peaks of historical extreme valuation (and beyond in several cases), and created a highly speculative market. By early 2022, in the face of rising inflation, Powell was forced to "prick the everything bubble", and his reversal of the Fed put was termed the Fed call (i.e. a call option being the opposite of a put option). (en)
- Le Greenspan put (en français : garantie Greenspan) est une politique monétaire menée par Alan Greenspan en réponse au krach d'octobre 1987. L'expression est venue à caractériser le relâchement des politiques monétaires de la Réserve fédérale des États-Unis après une crise économique. (fr)
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