This intellectualistic quality which is thus recognized as a protection of the inner life against the domination of the metropolis, becomes ramified into numerous specific phenomena. The metropolis has always been the seat of money economy because the many-sidedness and concentration of commercial activity have given the medium of exchange an importance which it could not have acquired in the commercial aspects of rural life. But money economy and the domination of the intellect stand in the closest relationship to one another. … Money is concerned only with what is common to all, i.e., with the exchange value which reduces all quality and individuality to a purely quantitative level. All emotional relationships between persons rest on their individuality, whereas intellectual relationships deal with persons as with numbers, that is, as with elements which, in themselves, are indifferent, but which are of interest only insofar as they offer something objectively perceivable. It is in this very manner that the inhabitant of the metropolis reckons with his merchant, his customer, and with his servant, and frequently with the persons with whom he is thrown into obligatory association.

XREF: Echoes Simmel's broader argument in 'The Metropolis and Mental Life' about the blasé attitude and calculative objectivity of urban life.

Georg Simmel, on individuality and social…, loc. 750