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In page Carsharing:

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Car sharing has also spread to other global markets with dense urban populations (such as Argentina, Brazil, China, India, Mexico, Russia and Turkey) given that population density is often a critical determinant of success for car sharing.[2] Successful car sharing development has tended to be associated mainly with densely populated areas, such as city centers and more recently university and other campuses. There are some programs (mostly in Europe) for providing services in lower density and rural areas.[citation needed] Low-density areas are considered more difficult to serve with car sharing because of the lack of alternative modes of transportation and the potentially larger distance that users must travel to reach the cars.