Stocks rallied in response to April\u2019s inflation rate falling to 3.4%. Plus: McDonald\u2019s shares rise 1.2% as the fast-food giant plans a $5 meal bundle this summer. J.R. Whalen reports.\n\n\n\nSign up for the WSJ's free What's News newsletter.\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices