Prof. Nicholas Bloom convened a discussion of The Sum of Us: What Racism Costs Everyone and How We Can Prosper Together by Heather McGhee, former president of the think tank Demos and the current chair of Color of Change, the nation’s largest online racial justice organization. McGhee charts how racism has been used to generate support for public policies that preserve inequality at the expense of everyone but the most elite classes in the U.S. and how cross-racial coalitions can produce a “solidarity dividend” that can benefit everyone.