[pas]

but it's not anyone else, it's the central bank of the USA, as mandated by Congress.

they provide price stability (by keeping the money supply corresponding to the demand) and they try to maximize employment (by helping the economy through providing liquidity, every central bank is the "lender of last resort" but that's for emergencies, usually they operate simply by providing forward guidance and conducting open market operations to keep the interbank interest rate close to the target rate).

don't think of them like just a bank, it's more like the Mint, combined with an expert panel that tries to smooth out the fluctuations of the economy ( https://en.wikipedia.org/wiki/Real_business-cycle_theory )

Also, as long as they don't try to get clever - like the Bank of Japan did with strategic loans ("window guidance" back in the 80s).