Another Way of Looking at the Essential and Inherent Unsoundness of Fractional Reserve Banking Is to Look at the Maturity Mismatching Problem, A Violation of the “Golden Rule of Banking”

Another way of looking at the essential and inherent unsoundness of fractional reserve banking is to note a crucial rule of sound financial management—one that is observed everywhere except in the banking business. Namely, that the time structure of the firm’s assets should be no longer than the time structure of its liabilities. In short, suppose that a firm has a note of $1 million due to creditors next January 1, and $5 million due the following January 1. If it knows what is good for it, it will arrange to have assets of the same amount falling due on these dates or a bit earlier. That is, it will have $1 million coming due to it before or on January 1, and $5 million by the year following. Its time structure of assets is no longer, and preferably a bit shorter, than its liabilities coming due. But deposit banks do not and cannot observe this rule. On the contrary, its liabilities—its warehouse receipts—are due instantly, on demand, while its outstanding loans to debtors are inevitably available only after some time period, short or long as the case may be. A bank’s assets are always “longer” than its liabilities, which are instantaneous. Put another way, a bank is always inherently bankrupt, and would actually become so if its depositors all woke up to the fact that the money they believe to be available on demand is actually not there.

—Murray N. Rothbard, The Mystery of Banking, 2nd ed. (Auburn, AL: Ludwig von Mises Institute, 2008), 98-99.