The economy of Los Angeles is driven by international trade, entertainment (television, motion pictures, video games, recorded music), aerospace, technology, petroleum, fashion, apparel, and tourism. Los Angeles is also the largest manufacturing center in the western United States. The contiguous ports of Los Angeles and Long Beach together comprise the fifth-busiest port in the world and the most significant port in the Western Hemisphere and is vital to trade within the Pacific Rim. Other significant industries include media production, finance, telecommunications, law, healthcare, and transportation. The Los Angeles-Long Beach-Santa Ana metropolitan statistical area (MSA) has a gross metropolitan product (GMP) of $735.7 billion (as of 2010), making it the third largest economic center in the world, after the Greater Tokyo Area and the New York-Newark-Bridgeport CSA. If counted as a country, the surrounding CSA has the 15th largest economy in the world in terms of nominal GDP. Los Angeles has been classified an "Alpha world city" according to a 2010 study by a research group at Loughborough University in England.
The city is home to seven Fortune 500 companies. They are aerospace contractor Northrop Grumman, energy company Occidental Petroleum, healthcare provider Health Net, metals distributor Reliance Steel & Aluminum, engineering firm AECOM, real estate group CBRE Group and builder Tutor Perini.