In the context of the Fed, what are the reasons that the ON RRP facility is structured such that loans are collateralised?
If we assume the Fed has zero credit risk, what is the benefit of actually exchanging Treasuries for reserves? The Fed can be assumed to service the interest payment and principal the next day, so in theory the collateral is not needed.
Is it simply to prevent "volatility" on the commercial banks balance sheets, where the loan principal suddenly "disappears"?