Entertainment and aerospace industries contribute heavily to the economic base of Los Angeles. The Primary Sector or agricultural societies in California is the leading agricultural state. California produces carrots, grapes, citrus fruits, and many other fruits and vegetables that cannot grow where there is frost. California has Mediterranean climate with frost-free climate which allows these fruits and vegetables grow. The Central Valley of California is also an important agricultural region. The Tertiary Sector also known as the service-sector including health care and retailing. These include physicians, dentists, lawyers, barbers, and other personal services. Retailers include Wal-mart, K-mart, and Target. Another component includes tourism. The Quaternary Sector includes government, financial services, research and development, education, journalism and the media, and other similar activities. In Los Angeles we can find the financial services industry. Los Angeles is involved in journalism. publishing, the media, and entertainment. The entertainment industry is involved with tourism. Tourists mostly enjoy going to Hollywood and homes of movie and television stars.
Source:
The Geography of North America, 2nd Edition
Hardwick, Shelley, Holtgrieve