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The degree to which the nodes of a network are directly connected with each other. A graph is connected if every node can be reached from some other node. The higher the ratio of the edges to the nodes in a network, the greater the connectivity. See Urban and Keitt (2001) Ecology 82 on graph theory as applied to connectivity in heterogeneous landscapes. Connectivity in a network is said to increase as economic development proceeds; see G. Vigar (2002).

Taylor (2002) Urb. Studs 39 measures a city's connectivity by summing the products of every firm's service value in the city with their service values in all other cities. US cities are generally less globally connected than their European Union and Pacific Asian counterparts—New York is the only US city with more non-US cities than US cities in its top ten of global connections (C. Taylor2005, Brookings Institution).

Subjects: Earth Sciences and Geography.

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