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Rh holds so far as the individual man finds in the chances, the diversity of interests and tasks, and in the vast unconscious co-operation of city life, the opportunity to choose his own vocation and develop his peculiar individual talents. The city offers a market for the special talents of individual men. Personal competition tends to select for each special task the individual who is best suited to perform it.

"The difference of natural talents in different men is, in reality, much less than we are aware of; and the very different genius which appears to distinguish men of different professions, when grown up to maturity, is not upon many occasions so much the cause, as the effect of the division of labour. The difference between the most dissimilar characters, between a philosopher and a common street porter, for example, seems to arise not so much from nature, as from habit, custom, and education. When they came into the world, and for the first six or eight years of their existence, they were perhaps very much alike, and neither their parents nor playfellows could perceive any remarkable difference. About that age, or soon after, they come to be employed in different occupations. The difference of talents comes then to be taken notice of, and widens by degrees, till at last the vanity of the philosopher is willing to acknowledge scarce any resemblance. But without the disposition to truck, barter, and exchange, every man must have procured to himself every necessary and conveniency of life which he wanted. All must have had the same duties to perform, and the same work to do, and there could have been no such difference of employment as could alone give occasion to any great difference of talent.....

"As it is the power of exchanging that gives occasion to the division of labour, so the extent of this division must always be limited by the extent of that power, or, in other words, by the extent of the market There are some sorts of industry, even of the lowest kind, which can be carried on nowhere but in a great town."

Success, under conditions of personal competition, depends upon concentration upon some single task, and this concentration stimulates the demand for rational methods, technical devices, and exceptional skill. Exceptional skill, while based on natural talent, requires special preparation, and it has called into existence the trade and professional schools, and finally bureaus for vocational guidance. All of these, either directly or indirectly, serve at once to select and emphasize individual differences.