The Passthrough of Treasury Supply to Bank Deposit Funding

We demonstrate the passthrough of Treasury supply to deposit funding through bank market power. We show that an increase in Treasury supply leads to a net deposit outflow. At the same time, reliance on wholesale funding decreases. The effect is heterogeneous in nature - banks in more competitive markets experience larger outflows. The explanatory power of Treasury supply is not driven by monetary policy and bank-specific investment opportunities. Our empirical findings are rationalized with a model of imperfect deposit competition. Consistent with The Deposits Channel of Monetary Policy, the model and empirics predict the opposite effect for Fed Fund rate hikes: there is a larger response in less competitive markets. Our results also shed light on the effect of the Reverse Repurchase (RRP) Facility on monetary policy passthrough.