=+10. Outdoor advertising, including billboards, ads on bus shelters, and shopping mall displays, accounts for only a tiny portion of the $110 billion spent on advertising in a typical year in the United States. ACNielsen is giving global positioning devices to 700 Chicagoans so it can track how many times they pass by specially coded billboards in the city. List some other ways you can think of to research the effectiveness of outdoor advertising and cite the pros and cons of each.