The power of a strong trade union to secure wage advances of this type is considerable, but it must not be exaggerated. Trade unions employ as a matter of course devices which, in the case of trusts, we regard as the extremest weapons of monopoly. To say, "If you buy from anyone except us, you must not buy at a lower price than ours," which Messrs. J. & P. Coats are represented as having done, is analogous to insisting that if non-unionists are employed, it shall be at the trade union rate, as every trade union very properly insists. To say, "You must buy _only_ from us," the method of the boycott, as it is called, is analogous to the very common refusal to work with non-unionists at all. But in one important respect the tactical position of a trade union is weaker than that of an ordinary combination. It has usually got a buyers' combination up against it, in the shape of an association of employers. The latter will be governed in their attitude towards the workpeople's demands, not only by immediate expediency, but also by their own sense of "what should be"; and they will usually resist demands for wages greatly in excess of those obtaining in comparable trades. In this way, the tendency for workers of the same efficiency to receive the same real wages in all employments is far stronger than might at first sight appear. If we had to rely for this result upon trade unions alone, it would be highly problematical. For here a psychological curiosity emerges, which, familiar and intelligible as it is, is none the less a curiosity. So far from still higher wages for well-paid workpeople being regarded in the world of manual labor as detrimental to the interests of other workpeople, it has become almost a point of honor to believe the contrary. A wage dispute in a particular trade is conceived as an engagement in a far-flung battle between Capital and Labor, in which success at any part of the line will facilitate the victory of the whole army. This conception contains a measure of truth, as regards immediate and purely temporary effects; though, even here, it is made to seem unduly plausible by the recurrence of trade cycles, which cause wages at any time to move in the same direction all along the line. But, if the foregoing analysis has been appreciated, the essential falsity of this notion should be evident. It is an illusion, which should receive no endorsement, either tacit or express, in any work on economics. The general wage level of a country cannot be regarded (except temporarily, and within narrow limits) as a function of the efficiency of labor organization; it depends on the far deeper economic facts set out in §3 above.