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A new edition of a book presenting a unified framework for studying the role of money and liquid assets in the economy, revised and updated. In Money, Payments, and Liquidity, Guillaume Rocheteau and Ed Nosal provide a comprehensive investigation into the economics of money, liquidity, and payments by explicitly modeling the mechanics of trade and its various frictions (including search, private information, and limited commitment). Adopting the last generation of the New Monetarist framework developed by Ricardo Lagos and Randall Wright, among others, Nosal and Rocheteau provide a dynamic general equilibrium framework to examine the frictions in the economy that make money and liquid assets play a useful role in trade. They discuss such topics as cashless economies; the properties of an asset that make it suitable to be used as a medium of exchange; the optimal monetary policy and the cost of inflation; the coexistence of money and credit; and the relationships among liquidity, asset prices, monetary policy; and the different measures of liquidity in over-the-counter markets. The second edition has been revised to reflect recent progress in the New Monetarist approach to payments and liquidity. Rocheteau and Nosal have added three new chapters: on unemployment and payments, on asset price dynamics and bubbles, and on crashes and recoveries in over-the-counter markets. The chapter on the role of money has been entirely rewritten, adopting a mechanism design approach. Other chapters have been revised and updated, with new material on credit economies under limited commitment, open-market operations and liquidity traps, and the limited pledgeability of assets under informational frictions.

The business of money creation is conceptually distinct from that of intermediation. Yet, these two activities are frequently-but not always-combined together in the form of a banking system. We develop a simple model to examine the question: When is banking essential? There is a role for money due to a lack of record-keeping and a role for intermediation due to the existence of private information: both money and intermediation are essential. When monitoring costs associated with intermediation are sufficiently low, the two activities can be separated from one another. However, when monitoring costs are sufficiently high, a banking system that combines these two activities is essential.

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