McDonald's posts rare profit miss, shares down 4%

(Reuters) - McDonald's Corp reported a quarterly profit that missed Wall Street estimates for the first time in two years as it invested heavily in sprucing up U.S. outlets and speeding up delivery, sending its shares down 4%.The company has been battling competition in the United States, especially in the past few quarters, from rival fast-food chains that are challenging McDonald's dominance with value meals and plant-based food options.McDonald's was late to the game in offering plant-based..