Published online by Cambridge University Press: 21 July 2015
The increase in population of wood and mountain barbarian tribes on one hand, and the increasing demand for labor in the developing culture areas on the other created, with increasing wealth, numerous lower or unclean services. When the local resident population declined to take them over, these occupations fell into the hands of alien workers of foreign origin who were permanently lodged in urban areas but retained their tribal affiliations (Max Weber, 1968 [1923], p. 12).