When the capital development of a country becomes a by-product of the activities of a casino, the job is likely to be ill-done - John Maynard Keynes

A valuation, which is established as the outcome of the mass psychology of a large number of ignorant individuals is liable to change violently as the result of a sudden fluctuation of opinion due to factors which really do not make much difference . . . since there will be no strong roots of conviction to hold it steady.

The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men, who believe themselves to be quite exempt from any intellectual influence, are usually the slaves of some defunct economist. Madmen in authority, who hear voices in the air, are distilling their frenzy from some academic scribbler of a few years back. I am sure that the power of vested interests is vastly exaggerated compared with the gradual encroachment of ideas. Not, indeed, immediately, but after a certain interval; for in the field of economic and political philosophy there are not many who are influenced by new theories after they are twenty-five or thirty years of age, so that the ideas which civil servants and politicians and even agitators apply to current events are not likely to be the newest. But, soon or late, it is ideas, not vested interests, which are dangerous for good or evil.

It is not easy for a free community to organise for war. We are not accustomed to listen to experts or prophets. Our strength lies in an ability to improvise. Yet an open mind to untried ideas is also necessary. No-one can say when the end will come. In the war services it is recognised that the best security for an early conclusion is a plan for long endurance.