Economic progress... means the discovery and application of better ways of doing things to satisfy our wants. The piping of water to a household that… - Kenneth E. Boulding

An international system consists of a group of interacting behavior units called "nations" or "countries," to which may sometimes be added certain supra-national organizations, such as the United Nations. Each of the behavior units in the system can be described in terms of a set of "relevant variables." Just what is relevant and what is not is a matter of judgment of the system-builder, but we think of such things as states of war or peace, degrees of hostility or friendliness, alliance or enmity, arms budgets, geographic extent, friendly or hostile communications, and so on. Having defined our variables, we can then proceed to postulate certain relationships between them, sufficient to define a path for all the variables through time. Thus we might suppose, with Lewis Richardson that the rate of change of hostility of one nation toward a second depends on the level of hostility in the second and that the rate of change of hostility of the second toward the first depends on the level of hostility of the first. Then, if we start from given levels of hostility in each nation, these equations are sufficient to spell out what happens to these levels in succeeding time periods.

If there is one idea that has dominated the history of the United States, it is the idea of progress. Yet analyses of this idea are surprisingly rare. Furthermore, in spite of having been founded by a rather small revolution, the dominant dynamic of the United States has been evolutionary, through social mutation (invention), production, and selection. In this paper, therefore, I propose to look at the larger question of the nature of evolutionary change, and the conditions under which change can be identified as progress.

Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist.