write this post in different words: by regulating the money supply and interest rates, the Federal Reserve affects the economy through monetary policy. The Fed's policy has changed during the last 20 years, with an emphasis on openness and communication, the use of unconventional instruments like quantitative easing, and a change in emphasis from money supply growth to interest rate targeting. In response to shifting economic conditions, these policies have been used in different ways over time, with a focus now more on promoting economic development and averting deflation