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.

First, the shaping of belief systems of any range into apparently logical wholes that are credible to large numbers of people is an act of creative synthesis characteristic of only a miniscule proportion of any population. Second, to the extent that multiple idea-elements of a belief system are socially diffused from such creative sources, they tend to be diffused as “packages,” which consumers come to see as “natural” wholes, for they are presented in such terms (“If you believe this, then you will also believe that, for it follows in such-and-such ways”).