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.