The owner of the material equipment, the capitalist-employer, is, in the typical case, not possessed of any appreciable fraction of the immaterial equipment necessarily drawn on in the construction and subsequent use of the material equipment owned (controlled) by him. His knowledge and training, so far as it enters into the question, is a knowledge of business, not of industry.[9] The slight technological proficiency which he has or needs for his business ends is of a general character, wholly superficial and impracticable in point of workmanlike efficiency; nor is it turned to account in actual workmanship. He therefore "needs in his business" the service of persons who have a competent working mastery of this immaterial technological equipment, and it is with such persons that his bargains for hire are made. By and large, the measure of their serviceability for his ends is the measure of their technological competency. No workman not possessed of some fractional mastery of the technological requirements is employed,--imbeciles are useless in proportion to their imbecility; and even unskilled and "unintelligent" workmen, so called, are of relatively little use, although they may be possessed of a proficiency in the commonplace industrial details such as would bulk large in absolute magnitude. The "common laborer" is, in fact, a highly trained and widely proficient workman when contrasted with the conceivable human blank supposed to have drawn on the community for nothing but his physique.