Flow maps are used most often to communicate an exchange of entities between two separate areas. Typically, the exchange is of economic or social affairs. The lines do not indicate actual paths of direction, but rather a simple connection. For example, this map show the distribution of Japanese car exports from January 2010. Each line originates from Japan and connects to a separate country; one that obviously buys cars from Japan. The thicker the line on this map, the more automotive business that particular country did with Japan in January of 2010.
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