However the McDonald brothers by no means acquired a bit of these earnings.
Sources:
[McDonald’s] https://www.mashed.com/72280/false-mcdonalds-facts-always-thought-true/
https://individuals.com/meals/11-surprising-facts-about-the-history-of-mcdonalds/
http://jpatton.bellevue.edu/micro/mcdonalds.html
https://company.mcdonalds.com/corpmcd/about-us/historical past.html
https://books.google.ca/books/about/Fast_Food.html?id=pCgSvoj4SBwC
https://books.google.ca/books/about/American_Cuisine_And_How_It_Got_This_Way.html?id=3AKLDwAAQBAJ
https://cash.howstuffworks.com/mcdonalds2.htm
https://books.google.ca/books/about/28_Business_Thinkers_Who_Changed_the_Wor.html?id=191kwTZ0l6YC
https://www.netflix.com/title/80101899
[Richard and Maurice McDonald] https://www.nytimes.com/1998/07/16/enterprise/richard-mcdonald-89-fast-food-revolutionary.html
https://www.mashed.com/147897/the-tragic-real-life-story-of-the-mcdonald-brothers/
https://www.dailymail.co.uk/information/article-3049644/How-McDonald-s-founder-cheated-brothers-REALLY-started-empire-300m-wrote-company-history-left-one-die-heart-failure-barely-millionaire.html
[Ray Kroc] https://play.google.com/retailer/audiobooks/particulars/Grinding_It_Out_The_Making_of_McDonald_s?id=AQAAAECMHRRdiM&hl=en_US
https://www.theatlantic.com/enterprise/archive/2017/01/ray-kroc-mcdonalds-america/514538/
https://www.forbes.com/websites/bradauerbach/2017/01/20/business-lessons-from-ray-kroc-the-founder-mcdonalds-story/#4056430f3534
[Harry J. Sonneborn] https://www.goodreads.com/writer/quotes/17532662.Harry_J_Sonneborn