Central Banking 101

Wang worked as a trader on the Federal Reserve's open market desk and wrote this to explain how the monetary system actually operates at the level of accounts and transactions rather than at the level of macroeconomic theory.

The distinguishing content is the plumbing. Wang explains the structure of the money system as tiers: central bank reserves, which only banks hold; commercial bank deposits, which the public holds; and shadow money including repurchase agreements, money market fund shares and Treasury bills, which institutions hold and treat as cash equivalents. He explains that reserves cannot leave the banking system and cannot be lent to the public, which corrects the money multiplier account still found in textbooks. He explains that bank lending creates deposits rather than deposits funding loans.

The operational chapters cover how the Federal Reserve implements policy: the floor system using interest on reserves and the overnight reverse repurchase facility, the effective federal funds rate and why it now trades where it does, the standing repo facility, and how quantitative easing actually works at the balance sheet level, which is an asset swap that changes the composition of what the private sector holds rather than putting money into the economy directly.

He also covers the Treasury market's structure including the primary dealers, the repurchase agreement market and its role in funding leverage, the eurodollar system, money market funds and their reform, and the September 2019 repo disruption which he explains through the interaction of reserve scarcity, dealer balance sheet constraints and Treasury issuance.

The book is short, practical and correct on the mechanics, which most accounts written by non-participants are not. It is descriptive rather than analytical and takes no position on whether policy is right. It is oriented entirely to the American system.