Economics is a very dangerous science.

Long run is a misleading guide to current affairs. In the long run we are all dead.

When my information changes, I alter my conclusions. What do you do, sir?

Markets can remain irrational longer than you can remain solvent.

Like Odysseus, the President looked wiser when he was seated.

It's not bringing in the new ideas that's so hard; it's getting rid of the old ones.

It has been pointed out already that no knowledge of probabilities, less in degree than certainty, helps us to know what conclusions are true, and that there is no direct relation between the truth of a proposition and its probability. Probability begins and ends with probability.