This doctrine has been qualified in practice by particular limitations to avert particular evils and to meet exceptional emergencies. But it is limited in special cases precisely because its general validity is regarded as beyond controversy, and, up to the eve of the present war, it was the working faith of modern economic civilization. What it implies is, that the foundation of society is found, not in functions, but in rights; that rights are not deducible from the discharge of functions, so that the acquisition of wealth and the enjoyment of property are contingent upon the performances of services, but that the individual enters the world equipped with rights to the free disposal of his property and the pursuit of his economic self-interest, and that these rights are anterior to, and independent of, any service which he may render. True, the service of society will, in fact, it is assumed, result from their exercise. But it is not the primary motive and criterion of industry, but a secondary consequence, which emerges incidentally through the exercise of rights, a consequence which is attained, indeed, in practice, but which is attained without being sought. It is not the end at which economic activity aims, or the standard by which it is judged, but a by-product, as coal-tar is a by-product of the {21} manufacture of gas; whether that by-product appears or not, it is not proposed that the rights themselves should be abdicated. For they are regarded, not as a conditional trust, but as a property, which may, indeed, give way to the special exigencies of extraordinary emergencies, but which resumes its sway when the emergency is over, and in normal times is above discussion.