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Noulas, A., Scellato, S., Lambiotte, R., Pontil, M. & Mascolo, C. A tale of many cities: universal patterns in human urban mobility. PLoS ONE 7, e37027 (2012).The difference comes from the scale of the study and perhaps the data . The mobility patterns in the global scale (e.g. air transportation and cargo ship movements) or national scale (using bank notes and mobile data calls) tend to follow the power law. However, at the city scale, human mobility tends to follow an exponential law. Source of data could also affect the results. Use of mobile phone calls and taxi data do not completely represent individuals daily mobility patterns. Overall, the exponential law of human mobility in cities could be partly explained by the economies of agglomeration and thus, following a "natural decay". While at the global scale where the economies of agglomeration does not play a significant role, the power law seems to better describe the mobility patterns.