To know the entire process of cash creation today, why don’t we develop a system that is hypothetical of. We shall concentrate on 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 reserve requirement is expressed as a needed book ratio; it specifies the ratio of reserves to checkable deposits a bank must keep. Banking institutions may hold reserves in excess of the needed degree; such reserves are known as extra reserves. Extra reserves plus needed reserves total that is equal.