COLLAPSE After the global financial crisis in 2009, the Federal Reserve took a series of measures to restore the economy, one of which was monetary easing. In fact, although the implementation of some measures was not timely, it eventually brought the economy back on track. On the one hand, the Fed's purchases of mortgage-backed securities increase the liquidity of money because it stimulates investors to enter the securities market. On the other hand, there is the quantitative easing policy. The main purpose of monetary easing policy is to reduce interest rates while increasing the money supply. An increase in the money supply means the existence of inflation. After the implementation of monetary easing policy, many investors began to return their goals to investment products, because low interest rates allowed them to make more investment decisions. In a piece of literature I reviewed, I learned that monetary policy must continue to play a role under low interest rates and has an unshirkable responsibility. In particular, the central bank and other government agencies bear an inescapable responsibility for maintaining financial stability. Shirking responsibility. This has basically become a consensus. Krugman also believes that the money supply should be increased and the money