Moreover, regulatory bodies, like the people who comprise them, have a marked life cycle. In youth they are vigorous, aggressive, evangelistic, and e… - John Kenneth Galbraith

Wisdom, itself, is often an abstraction associated not with fact or reality but with the man who asserts it and the manner of its assertion.

In any case, during the same month reassurance came from still higher authority. Andrew W. Mellon said, “There is no cause for worry. The high tide of prosperity will continue.” Mr. Mellon did not know. Neither did any of the other public figures who then, as since, made similar statements. These are not forecasts; it is not to be supposed that the men who make them are privileged to look farther into the future than the rest. Mr. Mellon was participating in a ritual which, in our society, is thought to be of great value for influencing the course of the business cycle. By affirming solemnly that prosperity will continue, it is believed, one can help insure that prosperity will in fact continue. Especially among businessmen the faith in the efficiency of such incantation is very great.

One of the things I argue in my book [A Journey Through Economic Time] is the extent to which people go to avoid rational decisions – the very large role of mental deficiency in economic history. Generally, people have been very resistant to attributing a causal role in history to stupidity.