Can Adidas ever catch up with Nike?

A few years ago it appeared as though Adidas might challenge Nike for the title of the world’s biggest maker of sportswear. The American giant was well ahead, to be sure. But its three-striped German rival had pep in its step. Under Kasper Rorsted, who took over as chief executive in October 2016, Adidas’s revenues shot up—by a cumulative 30% or so in the first three years of his stewardship. A lucrative deal from 2013 to make and sell…