We may safely leave many branches of knowledge to such as can devote themselves to special pursuits. We may safely accept what chemists tell us of chemistry, or astronomers of astronomy, or philologists of the development of language, or anatomists of our internal structure, for not only are there in such investigations no pecuniary temptations to warp the judgment, but the ordinary duties of men and of citizens do not call for such special knowledge, and the great body of a people may entertain the crudest notions as to such things and yet lead happy and useful lives. Far different, however, is it with matters which relate to the production and distribution of wealth, and which thus directly affect the comfort and livelihood of men. The intelligence which can alone safely guide in these matters must be the intelligence of the masses, for as to such things it is the common opinion, and not the opinion of the learned few, that finds expression in legislation.
— Henry George, Protection or Free Trade