To comprehend the entire process of cash creation today, let’s develop a system that is hypothetical of. We’re going to give attention to three banking institutions in this operational system: Acme Bank, Bellville Bank, and Clarkston Bank. Assume that most banking institutions have to hold reserves corresponding to 10% of the deposits that are checkable. The total amount of reserves banking institutions have to hold is named needed reserves. The book requirement is expressed as being a required reserve ratio; it specifies the ratio of reserves to checkable deposits a bank must keep.