The Denver MSA has a gross metropolitan product of $157.6 billion in 2010, making it the 18th largest metro economy in the United States. Denver's economy is based partially on its geographic position and its connection to some of the country's major transportation systems. Because Denver is the largest city within , it has become a natural location for storage and distribution of goods and services to the Mountain States, Southwest states, as well as all western states. Another benefit for distribution is that Denver is nearly equidistant from large cities of the Midwest, such as Chicago and St. Louis and some large cities of the West Coast, such as Los Angeles and San Francisco.