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Resources
http://www.history.com/news/hungry-history/chew-on-this-the-history-of-gum

http://www.wrigley.com/global/about-us/worldwide-locations.aspx

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Quaternary Stage: Involve the processing and dissemination of information. Includes high-level decision making roles.
Chewing gum has been tested to  likely improve test scores and studying skills. As well as chewing gum (sugar free) has also been tested to help people who have a dry mouth condition.

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Tertiary Stage: Provide services to the primary and secondary sectors.
William Wrigley Jr. started out as a soap salesman in Philadelphia. After moving to Chicago in 1891, he began offering store owners incentives to stock his products, such as free cans of baking powder with every order. When the baking powder proved a bigger hit than the soap, Wrigley sold that instead, and added in free packs of chewing gum as a promotion. In 1893, he launched two new gum brands, Juicy Fruit and Wrigley’s Spearmint.

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Secondary Stage: Add value to materials by changing their form or combining them into more useful - therefore more valuable - commodities.
Thomas Adams formed a company that by the late - 1880s was making gum with the chicle ingredient which was sold across the country. The gum imported to the United States from Mexico and Central America, served as the main ingredient in chewing gum until most manufacturers replaced it with synthetic ingredients by the mid - 1900s.

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Primary Stage: Harvesting or extracting (mining) something from the earth.
In the late 1840s, John Curtis developed the first commercial spruce tree gum. By the early 1850s, Curtis had constructed the world’s first chewing gum factory, in Portland, Maine.