Merck stock has handily outperformed the Dow Jones Industrial Average in 2024, sparked by aggressive buying from billionaires like Citadel's Kenneth Griffin.The Dow Jones Industrial Average has long been a bellwether for the overall health of the U.S. stock market, tracking 30 large publicly owned companies across various sectors. While the index has seen modest gains in 2024, one of its constituents has been significantly outperforming.Merck & Co. (MRK -0.06%), a pharmaceutical giant known for its cancer i ...