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Anthropological Invariants in Travel Behavior
"In this paper we put together a list of the basic instincts that drive and contain travelers' behavior, showing how they mesh with technological progress and economic constraints."
Humans are willing to travel for one hour a day on average.
Many early cities were planned around this logic of traveling about an hour on foot, it is the introduction of faster means of transportation such as cars and trains that humans are able to travel further in the same amount of time.
Transportation is a more unifying principle of the world than communication.
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