The economy of Salt Lake City, Utah is primarily service-oriented. While nearby Bingham Canyon Mine (the world's largest open-pit mine) provided a strong source of income during the 19th century, the city has evolved to an economy built on transit hubs, call centers, and seasonal tourism. The 2002 Olympic Winter Games gave a great boost to the area's economy. Many hotels and restaurants were built for the 2002 Olympics, and although many survive, they have suffered post-Olympic market saturation. Companies Adobe Backcountry.com Cisco DevMountain Guitar Center Intermountain Healthcare LexisNexis Lingotek Microsoft Nature's Sunshine NortonLifeLock Northrop Grumman Oracle Overstock.com Pluralsight Texas Instruments SanDisk SirsiDynix StubHub Sunrun Overview Salt Lake City is also the largest industrial banking center in the United States. The city is known as the "Crossroads of the West" for its central geography in the Census defined western United States. Salt Lake is about an equal distance from Los Angeles, Denver, San Francisco, Portland, Phoenix, and Seattle. As a result, Interstate 15 is a major corridor for freight traffic and the area is host to many regional centers such as Dannon Yogurt and Sysco. World War II brought many military and industrial jobs to the Salt Lake Valley. Hill Air Force Base was activated on November 7, 1940. Local, state, and federal governments have their largest presence in Salt Lake City, accounting for 21% of employment. Trade, transportation, and utilities account for another 18% of employment, with the major employers being the regional Delta Air Lines hub at Salt Lake City International Airport. Equally significant are the professional and business services, which account for another 18% of employment. Health services and health educational services comprise an additional 10% of employment. Other major employers include the University of Utah, Sinclair Oil Corporation, and the Church of Jesus Christ of Latter-day Saints. The Census estimates that the city's daytime population increases to 313,000 – the second largest increase for cities with at least 100,000 residents. This reflects the fact that a relatively small proportion of metropolitan area residents (18%) live within the city limits. Economy sectors GDP by industry Salt Lake City Industries by GDP value added 2011 Call centers It is rumored that call centers prefer the Salt Lake City and Provo areas because of the mild western accent of Utah natives that is easily understood in all regions of the United States, and considered pleasant by many. Marriott Hotels,