Ever since the beginning of modern science, the best minds have recognized that "the range of acknowledged ignorance will grow with the advance of science." Unfortunately, the popular effect of this scientific advance has been a belief, seemingly shared by many scientists, that the range of our ignorance is steadily diminishing and that we can therefore aim at more comprehensive and deliberate control of all human activities. It is for this reason that those intoxicated by the advance of knowledge so often become the enemies of freedom.

The problems raised by a conscious direction of economic affairs on a national scale inevitably assume even greater dimensions when the same is attempted internationally. The conflict between planning and freedom cannot but become more serious as the similarity of standards and values among those submitted to a unitary plan diminishes.

The idea that human kind can shape the world according to wish is what I call the fatal conceit

Our freedom of choice in a competitive society rests on the fact that, if one person refuses to satisfy our wishes, we can turn to another. But if we face a monopolist we are at his absolute mercy. And an authority directing the whole economic system of the country would be the most powerful monopolist conceivable…it would have complete power to decide what we are to be given and on what terms. It would not only decide what commodities and services were to be available and in what quantities; it would be able to direct their distributions between persons to any degree it liked.

There is only one '' principle that can preserve a free society: namely, the strict prevention of all coercion except in the enforcement of general abstract rules equally applicable to all.

..where effective competition can be created, it is a better way of guiding individual efforts than any other... regards competition as superior not only because it is in most circumstances the most efficient method known but even more because it is the only method by which our activities can be adjusted to each other without coercive or arbitrary intervention of authority.

To create conditions in which competition will be as effective as possible, to prevent fraud and deception, to break up monopolies- these tasks provide a wide and unquestioned field for state activity.