It is well known that the balance sheets of most major central banks significantly expanded in the aftermath of the financial crisis of 2007-2011, but the consequences of this expansion are not well understood. This book develops a unified framework to explain how and why central bank balance...

Monetary theory and policy are part of intertemporal public finance. The lecture reviews some interesting recent developments. The two ghosts are the venerable liquidity trap and the Pigou effect or real balance effect. The eccentricities are negative nominal interest rates and the helicopter...