John Maynard Keynes's monetary works, from A Tract on Monetary Reform to A Treatise on Money and The General Theory, are well known for their insights into the functioning of monetary economies and the conduct of monetary policy in such economies, that is, the appropriate goals of, and ways to implement, monetary policy. Less well known is that Keynes also thought carefully about the appropriate structure of monetary policy: the regulation of central banks and their relation to the state in matters of monetary policy.