_Counteracting Influences._--The importance of a gradual introduction of an improvement rather than a rapid one lies in the fact that it permits these influences to do their work and often to render the actual moving of laborers even from their subgroup unnecessary. Time is the salvation of the laborer menaced by an impending displacement from his field. When we see what is the grand resultant of all the dynamic influences we are studying, we shall see how this neutralizing and canceling of the labor-expelling force takes place. But for them one isolated change would tend to expel labor from its subgroup and would nearly always send it away from the point within an establishment where the new device is introduced. It usually attracts labor to this establishment and away from the inefficient or marginal ones. A gradual adoption of the improvement allows time not only for a general increase in the size and the wealth of the community, but for other influences which act more quickly and in practice make it nearly always unnecessary to reduce the total amount of labor in an industry which produces an article in permanent demand. Statistics may be confidently appealed to in support of this general statement. _The Dynamic Law of Price and its Effects._--We briefly noted in passing that the price of a product the making of which is subject to repeated improvements naturally tends toward the cost of it in the establishment having the latest method and the greatest facilities for production. The natural price at any time is the cost of that part of the supply which is created at the greatest advantage, and not the cost of the part produced at the greatest disadvantage, as an old formula expressed it. It is the mill that makes the goods most cheaply which is enlarging its product and bringing the price down toward its level of cost; as soon as other establishments get possession of the improvement they help forward the process, and as they get still better appliances they help in carrying the price to still newer and lower standards.