Fiduciary media consist of the proportion of perfect money substitutes which a bank issues but does not fully back by physical monetary units (i.e. gold or paper money) in their vaults.  Fiduciary media can exist in many forms including credit notes, checks or drafts. When a bank increases the amount of fiduciary media in an economy, ceteris paribus, the purchasing power of money will decline.
- Huerta de Soto, Jesus. "Money, Bank Credit, and Economic Cycles", 2006, 187.
- Schulak EM and Unterkofler H. "The Austrian School of Economics A History of Ideas, Ambassadors and Institutions", 2011.
- Huerta de Soto, Jesus. "Money, Bank Credit, and Economic Cycles", 2006, 700.