Fixing the “Textbook Lag” with FRED (Part II) : Monetary policy in a world of ample reserves

Your economics textbook may still say the Federal Reserve uses open market operations to influence the federal funds rate. But in today’s economy, the Fed uses different policy tools.
In simple terms, this is how monetary policy currently works: The FOMC sets a target range for the federal funds rate (FFR) and uses interest on excess reserves (IOER) and the overnight reverse repurchase agreement (ON RRP) facility to keep the FFR rate in the target range. (See our previous post for an introduction to this topic.)
The Fed pays IOER to banks holding reserves at the Fed, which offers those banks a safe, risk-free investment option. Arbitrage ensures that the FFR doesn’t drift too far from the IOER rate. If the FFR drifts much below the IOER rate, banks then have an incentive to borrow in the federal funds market at the lower FFR and deposit those reserves at the Fed to

Federal Reserve Source