Impact investing accounts for more than $1 trillion under management, and is expected to continue growing at a double-digit rate annually for the next decade. It's attracted a backlash, with activists successfully pushing companies to cut back on their commitment to diversity and inclusion. We hear from Chicago Booth's Priya Parrish, author of the new book The Little Book of Impact Investing: Aligning Profit and Purpose to Change the World, about what the critics get wrong.