The fact that people living farther away from a large city are less likely to subscribe to its newspaper is an example of the distance decay phenomena of spatial interaction.
Spatial interactions have also been studied in terms of inland and hierarchical. Linkage and node systems give rise to tributary or inland regional groups that, in turn, can be organized into hierarchical networks. Some of the earliest geographic studies of spatial interactions focused on the delineation of local hinterlands.
These can be based on tourism, retail market sector, social tourism, leisure travel, press circulation, or freight. The greater Chicago metropolitan area, primarily defined by its commuting relationships, also includes a number of smaller cities, each with its own retail and commuter hinterland. The result is a nice and complex hierarchy of central locations.
Nationwide, Chicago is itself integrated into several hierarchies. For example, in terms of air passenger traffic, New York has become the most dominant hub. During the 1990s, it was the main passenger source not only for a group of adjoining cities but also for larger cities further afield such as Chicago, Atlanta, and Los Angeles.
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