3. _In the larger industry the costs of management, supervision, and marketing are relatively less._ Division of labor decreases the difficulty of supervision in larger factories, where the processes are divided, systematized, and made a matter of routine. The necessary inspection of the results is more rapid and easy. The advertising of certain kinds of goods involves a large and inevitable outlay, which is relatively less for a larger business, as the greater the output the smaller the burden on each unit of the product. Combination effects a great saving in the number of commercial travelers, a result partly due to the decrease in competition, but partly also to better organization. Each of twenty different factories must send its drummers into every part of the country to seek business. In combination they can divide the territory, visit every merchant and get larger orders at smaller cost. Supplies can be purchased more cheaply in large amounts, and shipments in car-load and train-load lots make possible special (sometimes illegal) concessions from railroads and from carriers on waterways. [Sidenote: Limits to the growth of a single factory] 4. _There are some disadvantages in a large industry which put a limit to the growth of a single local establishment._ There is practically a limit to the advantages of size in a factory. When each man is working on the smallest possible subdivision of the product, doubling the number of employees will not increase his skill. When the finest machinery can be kept constantly in use, economy in its use has reached the maximum. As large factories tend to create cities around them, land rises in value and higher wages must be paid the workmen. Small factories are constantly seeking out lower rents, taxes, wages, salaries, cheaper local sources of materials, cheap though limited sources of power, and thus they compete successfully in many markets. The point is reached in the growth of establishments where oversight cannot be as perfect and complete; the eye of the master cannot be over all. The market that can be reached by one factory is limited by distance, as the cost of transportation finally offsets all the other advantages of large industry. [Sidenote: Do not necessarily limit consolidation] It is evident that most of these reasons apply to a single local factory with far greater force than to a federation of locally scattered plants. It was once believed that the growing disadvantages of large industry would set an early limit to consolidation. While there is a truth in this thought not to be overlooked, the effects must now be recognized to be more distant than was supposed. The limits to the advantages of combination have been removed by the application of the federative plan which makes possible under one management the maximum of advantages with the minimum of the disadvantages in large industry. That was the discovery of the early promoters of the trust movement.