Book excerpt: "Payments Systems in the U.S." is a comprehensive description of the systems - (cards, checks, cash, ACH, etc.) that move money between and among consumers and enterprises in the U.S. In clear and lively writing, the authors explain what they systems are, how they work, who uses them, who provides them, who profits from them and how they are changing. Anyone working in the payments industry - or needing to use payments products - can benefit from understanding this. The second edition updates information on card, ACH, and check systems, as well as providing perspective on developments in emerging payments.