The social system tends to be dominated by images... especially of the future, which act cybernetically, constantly guided by perceived divergences between the real and the ideal.

A world of unseen dictatorship is conceivable, still using the forms of democratic government.

The organization of science into disciplines sets up a series of ghettos with remarkable distances of artificial social space between them.

The controversy as to whether socialism is possible has been settled by the fact that it exists, and it is a fundamental axiom of my philosophy, at any rate, that anything that exists, is possible.

Mathematicians themselves set up standards of generality and elegance in their exposition which are a bar to understand.

One of the most important skills of the economist, therefore, is that of simplification of the model. Two important methods of simplification have been developed by economists. One is the method of partial equilibrium analysis (or microeconomics), generally associated with the name of Alfred Marshall and the other is the method of aggregation (or macro-economics), associated with the name of John Maynard Keynes.

Physicists can only talk to other physicists and economists to economists... sociologists often cannot even understand each other.