Bloomberg A federal rule change about how airlines count the luggage they lose has pitted Southwest Airlines Co., the “bags fly free” carrier, against its two larger rivals, which tend to charge for the privilege of using the cargo hold. For decades, an airline’s lost-bag rate has been calculated by dividing the number of people it flies by the number …

Bloomberg Chinese officials and state media said the country will defend itself in a trade war, warning that President Donald Trump’s tariff plans could backfire on the United States. Vice Premier Liu He told US Treasury Secretary Steven Mnuchin in a phone call that Washington’s investigation into alleged Chinese infringement of US intellectual property violates international rules and will harm …

Bloomberg Apple Inc. is designing and producing its own device displays for the first time, using a secret manufacturing facility near its California headquarters to make small numbers of the screens for testing purposes, according to people familiar with the situation. The technology giant is making a significant investment in the development of next-generation MicroLED screens, say the people, who …