Two possible approaches to the organization of general systems theory suggest themselves, which are to be thought of as complementary rather than com… - Kenneth E. Boulding

This concept of capital-rebuilding is so important that it may be desirable to digress for a moment. In the broadest sense of the word, capital means the sum total of the valuable things possessed by the individuals of a society, excluding "claims," that is, mere titles to property. The word is used to mean both the inventory of these valuable things; the houses, factories, machines, livestock, stocks of raw materials, and goods in all stages of completion; and also to mean the sum of the values of these things. It should generally be clear from the context which of these two meanings is intended.

In the imagination of those who are sensitive to the realities of our era, the earth has become a space ship, and this, perhaps, is the most important single fact of our day. For millennia, the earth in men's minds was flat and illimitable. Today, as a result of exploration, speed, and the explosion of scientific knowledge, earth has become a tiny sphere, closed, limited, crowded, and hurtling through space to unknown destinations. This change in man's image of his home affects his behaviour in many ways, and is likely to affect it much more in the future.

[Boulding grasps the significance of sociobiology's emphasis on biogenetics] that there are biogenetic factors in learning capacity and potential can hardly be denied... [yet] biogenetically imposed limits to human learning... seem to be much more remote... than are the limitations imposed by the biogenetic structure."