The service industry is the largest economic contributor in South Dakota. This sector includes the retail, finance, and healthcare industries. Citibank, which was at one time the largest bank holding company in the United States, established national banking operations in South Dakota in 1981 to take advantage of favorable banking regulations. Today the trust fund industry manages hundreds of billions of dollars and is known as tax haven for foreigners. Government spending is another important segment of the state's economy, providing over ten percent of the gross state product. Ellsworth Air Force Base, near Rapid City, is the second-largest single employer in the state.Reha, Bob. "South Dakota's Ellsworth AFB to stay open". . Minnesota Public Radio. August 26, 2005. Accessed September 8, 2007.
The service industry is the largest economic contributor in South Dakota This sector includes the retail finance and healthcare industries Citibank which was at one time the largest bank holding company in the United States established national banking operations in South Dakota in 1981 to take advantage of favorable banking regulations Today the trust fund industry manages hundreds of billions of dollars and is known as tax haven for foreigners Government spending is another important segment of the state's economy providing over ten percent of the gross state product Ellsworth Air Force Base near Rapid City is the second-largest single employer in the stateReha Bob "South Dakota's Ellsworth AFB to stay open"  Minnesota Public Radio August 26 2005 Accessed September 8 2007