"But," the objector says, "is it not true that when you limit the profits of the companies and base rates on cost of service you take away all incentive to economy and careful operation? The public, and not the company, gain if the cost of service is reduced; so why should the manager exert himself to economize? This very same principle has been tried. Many States have chartered railway corporations, and provided that fares and freight rates should be reduced when dividends exceeded a certain per cent., or else that a percentage of the surplus earnings, above the amount necessary to earn, say 10 per cent. dividends, should be paid into the State treasury. Of course the railway corporations who have been able to earn surplus dividends which they were not permitted to pay, have been sharp enough to spend their surplus on their own property instead of turning it over to the State treasury. How is it possible, then, to base rates on cost of service and still leave the incentive to economy, frugality, and efficiency which exists, when the corporation is permitted to make all the profits it can?" To discover a means of overcoming this difficulty, let us see how it is overcome under competition. A man invents a new machine, for instance, which effects a saving in the cost of some manufacturing process of 50 per cent. One manufacturer adopts it because it greatly increases his profits, and one by one his competitors follow suit. The competition between them cuts the prices lower and lower, till finally the consumers of the goods get all the benefit from the saving effected by the new machine, and the manufacturers' profits are no greater than they were originally. But the important point to be noted is this, that the benefit to the manufacturer continued long enough to repay him for introducing the machine. So in our attempts to base railway rates upon cost of service, we must permit the profit from the introduction of economies, the use of improved appliances, etc., to be gathered by the railway company long enough to induce it to work toward that end.