In spite of assigning little influence of economists' preachings on actual public policy, I do not believe that economists' influence is negligible. … - George Stigler

Prices instruct us on what people desire, but prices do not tell us why those things are desired. Our desires are accepted as a datum by economists: desires are some amalgam of biological needs, the cultural values of the society in which we grow up, and our own experiments.

Two main alternative views of the regulation of industry are widely held. The first is that regulation is instituted primarily for the protection and benefit of the public at large or some large subclass of the public. In this view, the regulations which injure the public -as when the oil import quotas increase the cost of petroleum products to America by $5 billion or more a year- are costs of some social goal (here, national defense) or, occasionally, perversions of the regulatory philosophy. the second view is essentially that the political process defies rational explanation: "politics" is an imponderable, a constantly and unpredictably shifting mixture of forces of the most diverse nature, comprehending acts of great moral virtue (the emancipation of slaves) and of the most vulgar venality (the congressman feathering his own nest).

We are entitled to be disappointed, but not to be surprised, by the persistence of governmental intervention in economic life. A school of thought attributes great influence to public opinion in the movements toward or away from laissez-faire. Among the many members of this school one may mention Albert Venn Dicey, John Maynard Keynes, and Milton Friedman.