Central bank bills (CBBs or securities) are usually adopted as tools for mopping up excess reserves and enabling the development of liquid money markets (Gevorkyan, 2015;Gray, 2006;Gray & Pongsaparn, 2015; Nyawata, 2012). While the liability-side CBBs might indeed be useful for fostering money markets, this paper demonstrates empirically that there is more to CBBs. In particular, the paper proposes that the central bank's one-sided sales of CBBs to the private sector perform like an instrument of monetary policy by stabilizing the exchange rate through easing demand pressure in the domestic foreign exchange (FX) market. The central bank sells the