This contention is supported by two different lines of reasoning. The first is that, because of these differences, there will tend to be a flow of labor away from the less favorable points of employment within the area of standardization towards the more favorable. This flow, it is said, will cause a reappearance of the differentials which existed before standardization. The first comment to be made on this line of reasoning is explanatory, rather than contradictory. It is true that there may be some tendency for labor to flow from the less favorable points to the more favorable. But it must be remembered that the standard wage is intended only as a minimum. If differentials over the standard wage did arise in enterprises where the conditions of labor were worse than the average, or in regions where the cost of living was higher than the average, such differentials would not be incompatible with the ends sought, when standardization is enforced. Secondly, it may be commented that the experience of the past does not, in general, support the contention. In many industries the same standard wage scale applies over an area in which there are real differences of the kind set forth above, and no differentials as between the different points within the area have arisen--as, for example, on the railroads. This is to be accounted for, firstly, by the influence of the idea of standardization over trade union activity and policy; secondly, by the fact that relative money wages tend to govern, in a great measure, the calculations and movements of the wage earners; thirdly, by the fact that the application of the principle of standardization is in itself a strong force toward bringing about a leveling in the conditions of employment throughout an industry. The second line of reasoning with which this contention is supported is that the trade unions themselves will not long support any policy of standardization which does not make explicit allowances for such differences as are in question. It is said that the organization of the workers at the points where the cost of living was relatively high would insist upon a differential over other places for that reason. Such, for example, was the argument of the employers' counsel before the Court of Inquiry on the wages of transport workers (Great Britain), "... He submitted that one of the foundations of his argument was that in fixing wages they must have regard to the class of work. Having regard to the very great diversity of conditions and of methods in the different ports, and to the class of work done, he submitted that they could not standardize. They must do in the case of the ports as they did in the case of the coal mines."[100]