Elon Musk and Mark Zuckerberg have been engaged in a competitive history with each other, sparking speculation about a potential cage match. The two billionaires have exchanged messages on social media, including a tweet from Musk stating he's "up for a cage fight" with Zuckerberg, who responded by posting a screenshot of the tweet. A cage match between the two has been discussed in various news outlets, with some predicting when and if it will occur. The market resolves to yes if a publicly-evident cage match directly between Musk and Zuckerberg occurs before January 1, 2024, or if a fight occurs before December 31, 2023, 11:59 PM ET. A consensus of credible reporting will also be used as the primary resolution source for the market's outcome.