Many of the wonderful-sounding ideas that have been tried as government policies have failed disastrously. Because so few people bother to study history, often the same ideas and policies have been tried again, either in another country or in the same country at a later time — and with the same disastrous results. One of the ideas that has proved to be almost impervious to evidence is the idea that wise and far-sighted people need to take control and plan economic and social policies so there will be a rational and just order, rather than chaos resulting from things being...