I get a lot of queries from readers about how the banking system operates. One recurring theme relates to the role of deposits in the banking system. Mainstream economic theory considers banks to be institutions that take in deposits which then provides them with the funds to on-lend at a profit. Accordingly, the ability of private banks to lend is considered to be constrained by the reserves they hold. While students find it hard to think outside of this construction, the reality is very different. Banks do not operate in this way. From the perspective of Modern Monetary Theory (MMT) private bank lending is unconstrained by the quantity of reserves the bank holds at any point in time. We say that loans create deposits. So then what is the role of deposits in MMT. That is the topic for today. I am deliberately simplifying to get the essential understanding across.