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.

We face the dilemma... that if everyone gets his deserts, some may be driven from the table: and if everyone comes to the table, some may not get their deserts. In practice, this seems to be resolved by the establishment of a social minimum as reflected for instance, in the poor law, in social security and various welfare services. The principle of desert come into play above this social minimum. That is to say, society lays a modest table at which all can sup and a high table at which the deserving can feast

In view of the importance of philanthropy in our society, it is surprising that so little attention has been given to it by economic or social theorists. In economic theory, especially, the subject is almost completely ignored. This is not, I think, because economists regard mankind as basically selfish or even because economic man is supposed to act only in his self-interest; it is rather because economics has essentially grown up around the phenomenon of exchange and its theoretical structure rests heavily on this process.

In spite of the moderate usefulness of what the economist has to say on this subject... there is a cry for a cultural anthropologist or even a psychologist when the economist runs into sacred cows, extended families, traditional motivations, levels of achievement, and social morale, all of which may be more important to economic development than any of the traditional economic variables. We still await a true synthesis of the insights of economics with those of other social sciences in the area

Nations are divided into "good"and "bad"-the enemy is all bad, one's own nation is of spotless virtue. Wars are either acts of God or acts of the other nations, which always catch us completely by surprise. To a student of international systems the national image even of respectable, intellectual, and powerful people seems naive and untrue. The patriotism of the sophisticated cannot be a simple faith. There is, however, in the course of human history a powerful and probably irreversible movement toward sophistication. We can wise up, but we cannot wise down, except at enormous cost in the breakdown of civilizations, and not even a major breakdown results in much loss of knowledge.

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.

Justification, in terms of the broadening of freedom, for any particular form of institution of property must be argued in terms of whether the losses caused by the restrictions imposed are greater or less than the gains derived from the elimination of costly conflict.

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 previously dragged it from a well, the growing of two blades of grass where one grew before, the development of a power loom that enables one man to weave ten times as much as he could before, the use of steam power and electric power instead of horse or human power — all these things clearly represent economic progress.

The word 'policy' generally refers to the principles that govern action directed towards given ends. Any study of policy therefore should concern itself with three things — what we want (the ends), how we get it (the means), and who are 'we,' that is, what is the nature of the organization or group concerned. Science is concerned with means rather than with ends. The study of "what we want" (objectives) extends beyond the boundaries of the social sciences into the field of ethics. It is not the business of the social sciences to evaluate the ultimate ends of human activity. The social sciences, therefore, cannot give a final answer to the question whether any given policy is right. The social scientist can study what people say they want, what they think they want and may even infer from their behaviour what they really want, but it is not the business of science to say whether people want right things.

Without the heroic, man has no meaning; without the economic, he has no sense. Economic man is most likely to be economic woman — a good wife, pulling the coat tails of her heroic husband, checking his extravagances of speech and action with words of caution and good sense. But without the heroic coat tails to pull, life for both of them would be dull and savorless indeed.

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.

It is clear that the building of models is not a purely mechanical process but requires skill of a high order – not merely mathematical skill but a sensitivity to the relative importance of different factors and a critical, almost an artistic, faculty in the selection of behaviour equations which are reasonable, tentative hypotheses in explaining the behaviour of actual economies.

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[The notion of equilibrium ] is a notion which can be employed usefully in varying degrees of looseness. It is an absolutely indispensable part of the toolbag of the economist and one which he can often contribute usefully to other sciences which are occasionally apt to get lost in the trackless exfoliations of purely dynamic systems.