As large and increasing numbers press more heavily upon available resources, the economic position of the society undergoing this ordeal becomes ever more precarious. This is especially true of those underdeveloped regions, where a sudden lowering of the death rate by means of DDT, penicillin and clean water has not been accompanied by a corresponding fall in the birth rate. In parts of Asia and in most of Central and South America populations are increasing so fast that they will double themselves in little more than twenty years. If the production of food and manufactured arti­cles, of houses, schools and teachers, could be in­creased at a greater rate than human numbers, it would be possible to improve the wretched lot of those who live in these underdeveloped and over-populated countries. But unfortunately these countries lack not merely agricultural machinery and an industrial plant capable of turning out this machinery, but also the capital required to create such a plant. Capital is what is left over after the primary needs of a population have been satisfied. But the primary needs of most of the people in underdeveloped countries are never fully satisfied. At the end of each year almost nothing is left over, and there is therefore almost no capital avail­able for creating the industrial and agricultural plant, by means of which the people's needs might be satisfied. Moreover, there is, in all these underdevel­oped countries, a serious shortage of the trained man­power without which a modern industrial and agricul­tural plant cannot be operated. The present educa­tional facilities are inadequate; so are the resources, financial and cultural, for improving the existing facili­ties as fast as the situation demands. Meanwhile the population of some of these underdeveloped countries is increasing at the rate of 3 per cent per annum.

Their tragic situation is discussed in an important book, published in 1957 — The Next Hundred Years, by Professors Harrison Brown, James Bonner and John Weir of the California Institute of Technology. How is mankind coping with the problem of rapidly increasing numbers? Not very successfully. "The evidence suggests rather strongly that in most underdeveloped countries the lot of the average individual has wor­sened appreciably in the last half century. People have become more poorly fed. There are fewer available goods per person. And practically every attempt to improve the situation has been nullified by the relent­less pressure of continued population growth."

Whenever the economic life of a nation becomes pre­carious, the central government is forced to assume additional responsibilities for the general welfare. It must work out elaborate plans for dealing with a criti­cal situation; it must impose ever greater restrictions upon the activities of its subjects; and if, as is very likely, worsening economic conditions result in polit­ical unrest, or open rebellion, the central government must intervene to preserve public order and its own authority. More and more power is thus concentrated in the hands of the executives and their bureaucratic managers. But the nature of power is such that even those who have not sought it, but have had it forced upon them, tend to acquire a taste for more. "Lead us not into temptation," we pray — and with good reason; for when human beings are tempted too enticingly or too long, they generally yield. A democratic constitu­tion is a device for preventing the local rulers from yielding to those particularly dangerous temptations that arise when too much power is concentrated in too few hands. Such a constitution works pretty well where, as in Britain or the United States, there is a traditional respect for constitutional procedures. Where the republican or limited monarchical tradition is weak, the best of constitutions will not prevent ambi­tious politicians from succumbing with glee and gusto to the temptations of power. And in any country where numbers have begun to press heavily upon avail­able resources, these temptations cannot fail to arise. Over-population leads to economic insecurity and so­cial unrest. Unrest and insecurity lead to more con­trol by central governments and an increase of their power. In the absence of a constitutional tradition, this increased power will probably be exercised in a dictatorial fashion. Even if Communism had never been invented, this would be likely to happen. But Com­munism has been invented. Given this fact, the proba­bility of over-population leading through unrest to dic­tatorship becomes a virtual certainty. It is a pretty safe bet that, twenty years from now, all the world's over-populated and underdeveloped countries will be under some form of totalitarian rule — probably by the Communist party.

How will this development affect the over-populated, but highly industrialized and still democratic coun­tries of Europe? If the newly formed dictatorships were hostile to them, and if the normal flow of raw materials from the underdeveloped countries were de­liberately interrupted, the nations of the West would find themselves in a very bad way indeed. Their in­dustrial system would break down, and the highly de­veloped technology, which up till now has permitted them to sustain a population much greater than that which could be supported by locally available resources, would no longer protect them against the consequences of having too many people in too small a territory. If this should happen, the enormous powers forced by unfavorable conditions upon central govern­ments may come to be used in the spirit of totalitarian dictatorship.

The United States is not at present an over-popu­lated country. If, however, the population continues to increase at the present rate (which is higher than that of India's increase, though happily a good deal lower than the rate now current in Mexico or Guatemala), the problem of numbers in relation to available resources might well become troublesome by the begin­ning of the twenty-first century. For the moment over­population is not a direct threat to the personal free­dom of Americans. It remains, however, an indirect threat, a menace at one remove. If over-population should drive the underdeveloped countries into totali­tarianism, and if these new dictatorships should ally themselves with Russia, then the military position of the United States would become less secure and the preparations for defense and retaliation would have to be intensified. But liberty, as we all know, cannot flour­ish in a country that is permanently on a war footing, or even a near-war footing. Permanent crisis justifies permanent control of everybody and everything by the agencies of the central government. And permanent crisis is what we have to expect in a world in which over-population is producing a state of things, in which dictatorship under Communist auspices becomes almost inevitable.