Banks cannot lend out reserves directly to customers. When banks make loans, they simultaneously create a new deposit in the borrower's bank account, thereby creating new money. The level of bank reserves is determined by the central bank's asset purchases, the public's demand for cash, and government deposits. While quantitative easing aims to spur bank lending, it works through more indirect channels than the conventional view that excess reserves will be lent out. Understanding the balance sheet mechanics of how banks create credit is important for evaluating policies like quantitative easing.