it is best to resign to voluntary agency, the community needs some other security for the fit performance of the service than the interest of the managers; and it is the part of government, either to subject the business to reasonable conditions for the general advantage, or to retain such power over it, that the profits of the monopoly may at least be obtained for the public. This applies to the case of a road, a canal, or a railway. These are always, in a great degree, practical monopolies; and a government which concedes such monopoly unreservedly to a private company, does much the same thing as if it allowed an individual or an association to levy any tax they chose, for their own benefit, on all the malt produced in the country, or on all the cotton imported into it. To make the concession for a limited time is generally justifiable, on the principle which justifies patents for inventions: but the state should either reserve to itself a reversionary property in such public works, or should retain, and freely exercise, the right of fixing a maximum of fares and charges, and, from time to time, varying that maximum. It is perhaps necessary to remark, that the state may be the proprietor of canals or railways without itself working them; and that they will almost always be better worked by means of a company, renting the railway or canal for a limited period from the state.

§ 12.⁠To a fourth case of exception I must request particular attention, it being one to which, as it appears to me, -the attention of political economists has not yet been sufficiently drawn. There are matters in which the interference of law is required, not to overrule the judgment of individuals respecting their own interest, but to give effect to that judgment: they being unable to give effect to it except by concert, which concert again cannot be effectual unless it receives validity and sanction from the law. For illustration, and without prejudging the particular point, I may advert to the question of diminishing the hours of labour. Let us