Unelected Power: The Quest for Legitimacy in Central Banking and the Regulatory State, by Paul Tucker, Princeton University Press. In certain significant areas, politicians have entrusted economic technocrats with the task of making politically significant policy decisions. The most important examples are in monetary policy and financial regulation, both almost universally carried out by independent central banks. In this important book, Paul Tucker, a former deputy governor of the Bank of England, analyses where and how to delegate these and other responsibilities, and where and when such delegation risks undermining democratic legitimacy itself.