The moniker given to the policies implemented by former Fed Chair Alan Greenspan that halted excessive stock market declines is known as "Greenspan put." The idea behind this policy was that the Federal Reserve would step in and buy stocks if they fell too far, preventing any major crashes. This helped to keep the markets stable and allowed investors to feel more confident about investing their money.Critics of Greenspan put say that it caused stock prices to become inflated and led to the housing bubble and financial crisis. However, others argue that it was necessary in order to avoid a larger crash and protect investors' interests. Overall, Greenspan put was a controversial policy but one that had a significant impact on the stock market.