When the facts change, I change my mind. What do you do, sir? - John Maynard Keynes

The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men, who believe themselves to be quite exempt from any intellectual influences, are usually the slaves of some defunct economist. Madmen in authority, who hear voices in the air, are distilling their frenzy from some academic scribbler of a few years back...But, soon or late, it is ideas, not vested interests, which are dangerous for good or evil.

The forces of the nineteenth century have run their course and are exhausted.

Practical men, who believe themselves to be quite exempt from any intellectual influence, are usually the sleeves of some defunct economist