The only religion that still demands human sacrifice is nationalism. - Kenneth E. Boulding

The use of isoquants to describe the production function did not develop to any great extent until the thirties.

The closed economy of the future might similarly be called the 'spaceman' economy, in which the earth has become a single spaceship, without unlimited reservoirs of anything, either for extraction or for pollution, and in which, therefore, man must find his place in a cyclical ecological system

The ability to work with systems of general equilibrium is perhaps one of the most important skills of the economist — a skill which he shares with many other scientists, but in which he has perhaps a certain comparative advantage.