You can travel from one end of the industrialized world to the other and almost the only people you will find engaging in backbreaking toil are people who are doing it for sport. To find people whose day's toil has not been lightened by mechanical invention, you must go to the non-capitalist world.

For one thing, there are many "inventions" that are not patentable. The "inventor" of the supermarket, for example, conferred great benefits on his fellowmen for which he could not charge them. Insofar as the same kind of ability is required for the one kind of invention as for the other, the existence of patents tends to divert activity to patentable inventions.

The true test of any scholar's work is not what his contemporaries say, but what happens to his work in the next 25 or 50 years. And the thing that I will really be proud of is if some of the work I have done is still cited in the text books long after I am gone.

There is no good way of measuring poverty.

The heart of the liberal philosophy is a belief in the dignity of the individual, in his freedom to make the most of his capacities and opportunities according to his own lights.

If you cannot state a proposition clearly and unambiguously, you do not understand it.

Anything that government can do, private enterprise can do for half the cost.