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Transportation plays a major role in the U.S. economy. About 10% of the U.S. Gross Domestic Product (GDP) in 2007 is related to transportation. Housing, health care, and food are the only categories with greater shares of the GDP.
GDP by Category, 2007
* Includes all consumer and government purchases of goods (e.g. vehicle and fuel) and services (e.g. auto insurance) and exports related to transportation.