Competition, in fact, has only become in any considerable degree the governing principle of contracts, at a comparatively modern period. The further we look back into history, the more we see all transactions and engagements under the influence of fixed customs. The relations, more especially between the land-owner and the cultivator, and the payments made by the latter to the former, are, in all states of society but the most modern, determined by the usage of the country. The custom of the country is the universal rule; nobody thinks of raising or lowering rents, or of letting land, on other than the customary conditions. Competition, as a regulator of rent, has no existence. Prices, whenever there was no monopoly, came earlier under the influence of competition, and are much more universally subject to it, than rents. The wholesale trade, in the great articles of commerce, is really under the dominion of competition. But retail price, the price paid by the actual consumer, seems to feel very slowly and imperfectly the effect of competition; and, when competition does exist, it often, instead of lowering prices, merely divides the gains of the high price among a greater number of dealers. The influence of competition is making itself felt more and more through the principal branches of retail trade in the large towns. All professional remuneration is regulated by custom. The fees of physicians, surgeons, and barristers, the charges of attorneys, are nearly invariable. Not certainly for want of abundant competition in those professions, but because the competition operates by diminishing each competitor’s chance of fees, not by lowering the fees themselves. These observations must be received as a general correction to be applied whenever relevant, whether expressly mentioned or not, to the conclusions contained in the subsequent portions of this treatise. Our reasonings must, in general, proceed as if the known and natural effects of competition were actually produced by it, in all cases in which it is not restrained by some positive obstacle. Where competition, though free to exist, does not exist, or where it exists, but has its natural consequences overruled by any other agency, the conclusions will fail more or less of being applicable. To escape error, we ought, in applying the conclusions of political economy to the actual affairs of life, to consider not only what will happen supposing the maximum of competition, but how far the result will be affected if competition falls short of the maximum. § 2. The Wages-fund, and the Objections to it Considered.