https://melmagazine.com/en-us/story/the-economic-breakdown-of-a-boxing-purse-who-gets-what
https://www.badlefthook.com/boxing-purse-reports
https://www.bloodyelbow.com/2019/7/17/20691949/prize-fighting-a-look-at-the-inequality-in-boxing-purses-money-finances
https://en.wikipedia.org/wiki/Matchroom_Sport
https://en.wikipedia.org/wiki/KSI_vs._Logan_Paul