Since 2002, the Fed has set the primary discount rate above the IOER rate. Why is this likely to prevent the spikes in the market federal funds similar to the ones that occurred in previous years?

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The Answer of  Since 2002, the Fed has set the primary discount rate above the IOER rate. Why is this likely to prevent the spikes in the market federal funds similar to the ones that occurred in previous years?

Since 2002, the Fed Has Set the Primary Discount Rate