In a simple cash-credit model, I study the effects of the combination of costly tax collection and tax evasion on fiscal and monetary policy for optimal resource allocation. Allowing the informal sector to use cash more intensively than the formal sector, I compute the optimal interest and tax...

From the New York Times bestselling author of This Time Is Different, “a fascinating and important book” (Ben Bernanke) about the surprising reasons why paper money lies at the heart of many of the world’s most difficult problemsThe world is drowning in cash—and it’s making us poorer...