The circumstance that it is uncertain whether a need for a good will be felt during the period of our plans does not, therefore, exclude the possibility that we will provide for its eventual satisfaction, and hence does not cause the reality of our requirements for goods necessary to satisfy such needs to be in question. On the contrary, men provide in advance, and as far as their means permit, for the eventual satisfaction of these needs also, and include the goods necessary for their satisfaction in their calculations whenever they determine their requirements as a whole.5
But what has been said here of needs whose appearance is altogether uncertain is fully as true where there is no doubt that a need for a good will arise but only uncertainty as to the intensity with which it will be felt, since in this case also men correctly consider their requirements to be fully met when they are able to have at their disposal quantities of goods sufficient for all anticipated eventualities.
A further point that must be taken into consideration here is the capacity of human needs to grow. If human needs are capable of growth and, as is sometimes maintained, capable of infinite growth, it could appear as if this growth would extend the limits of the quantities of goods necessary for the satisfaction of human needs continually, indeed even to complete infinitely, and that therefore any advance provision by men with respect to their requirements would be made utterly impossible.
On this subject of the capacity of human needs for infinite growth, it appears to me, first of all, that the concept of infinity is applicable only to unlimited progress in the development of human needs, but not to the quantities of goods necessary for the satisfaction of these needs during a given period of time. Although it is granted that the series is infinite, each individual element of the series is neverthe1ess finite. Even if human needs can be considered unlimited in their development into the most distant periods of the future, they are nevertheless capable of quantitative determination for all given, and especially for all economically significant, time periods. Thus, even under the assumption of uninterrupted progress in the development of human needs, we have to deal with finite and never with infinite, and thus completely indeterminate, magnitudes if we concern ourselves only with definite time periods.
If we observe people in provident activity directed to the satisfaction of their future needs, we can easily see that they are far from letting the capacity of their needs to grow escape their attention. On the contrary, they are most diligently concerned to take account of it. A person expecting an increase in his family or a higher social position will pay due attention to his increased future needs in the construction and furnishing of dwellings and in the purchase of carriages and similar durable goods. As a rule, and as far as his means will permit, he will attempt to take account of the higher claims of the future, not in a single connection only, but with respect to his holdings of goods as a whole. We can observe an analogous phenomenon in the activities of municipal governments. We see municipalities constructing waterworks, public buildings (schools, hospitals, etc.), parks, streets, and so on, with attention not only to the needs of the present, but with due consideration to the increased needs of the future. Naturally this tendency to give attention to future needs is even more distinctly evident in the activities of national governments.
To summarize what has been said, it appears that human requirements for consumption goods are magnitudes whose quantitative determination with respect to future time periods poses no fundamental difficulties. They are magnitudes about which, in activities directed to the satisfaction of their needs, men actually endeavor to attain clarity within feasible limits and insofar as a practical necessity compels them-that is, their attempts to determine these magnitudes are limited, on the one hand, to those time periods for which, at any time, they plan to make provision and, on the other hand, to a degree of exactness that is sufficient for the practical success of their activity.
Taken From : PRINCIPLES OF ECONOMICS
