But the first cause may be anticipated by wise marriage laws.... The full discussion of these laws will come later, but here one may insist that Utopia will control the increase of its population. Without the determination and ability to limit that increase as well as to stimulate it whenever it is necessary, no Utopia is possible. That was clearly demonstrated by Malthus for all time. The second cause is not so easily anticipated, but then, though its immediate result in glutting the labour market is similar, its final consequences are entirely different from those of the first. The whole trend of a scientific mechanical civilisation is continually to replace labour by machinery and to increase it in its effectiveness by organisation, and so quite independently of any increase in population labour must either fall in value until it can compete against and check the cheapening process, or if that is prevented, as it will be in Utopia, by a minimum wage, come out of employment. There is no apparent limit to this process. But a surplus of efficient labour at the minimum wage is exactly the condition that should stimulate new enterprises, and that in a State saturated with science and prolific in invention will stimulate new enterprises. An increasing surplus of available labour without an absolute increase of population, an increasing surplus of labour due to increasing economy and not to proliferation, and which, therefore, does not press on and disarrange the food supply, is surely the ideal condition for a progressive civilisation. I am inclined to think that, since labour will be regarded as a delocalised and fluid force, it will be the World State and not the big municipalities ruling the force areas that will be the reserve employer of labour. Very probably it will be convenient for the State to hand over the surplus labour for municipal purposes, but that is another question. All over the world the labour exchanges will be reporting the fluctuating pressure of economic demand and transferring workers from this region of excess to that of scarcity; and whenever the excess is universal, the World State--failing an adequate development of private enterprise--will either reduce the working day and so absorb the excess, or set on foot some permanent special works of its own, paying the minimum wage and allowing them to progress just as slowly or just as rapidly as the ebb and flow of labour dictated. But with sane marriage and birth laws there is no reason to suppose such calls upon the resources and initiative of the world more than temporary and exceptional occasions. Section 4