[on the theory of the firm] It is exactly analogous to the analysis of the reactions of a consumer by means of indifferent curves. Indeed, a consumer is merely a 'firm' whose product is 'utility.'

The world moves into the future as a result of decisions, not as a result of plans. Plans are significant only insofar as they affect decisions.

[In science any model depends on a pre-chosen taxonomy] a set of classifications into which we divide the enormous complexity of the real world... Land, labor, and capital are extremely heterogeneous aggregates, not much better than earth, air, fire, and water.

Integrative power [is] the ultimate power

What exists, is possible.

In any evolutionary process, even in the arts, the search for novelty becomes corrupting.

The thing that distinguishes social systems from physical or even biological systems is their incomparable (and embarrassing) richness in special cases. Generalizations in the social sciences are mere pathways which lead through a riotous forest of individual trees, each a species unto itself. The social scientist who loses this sense of the essential individuality and uniqueness of each case is all too likely to make a solemn scientific ass of himself, especially if he thinks that his faceless generalizations are the equivalents of the rich vareity of the world.