Robert Ezra Park,
The City: Suggestions for the investigation of human behavior in the city environment
(1915)
“ However, mobility in an individual or in a population is measured, not merely by change of location, but rather by the number and variety of the stimulations to which the individual or the population responds. Mobility depends, not merely upon transportation, but upon communication. Education and the ability to read, the extension of the money economy to an ever-increasing number of the interests of life in so far as it has tended to depersonalize social relations—all these have vastly increased the mobility of modern peoples. ”
