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Sheryl WuDunn: Why all Americans should care about inequality


Pulitzer Prize-Winning Journalist Sheryl WuDunn, co-author with her husband Nicholas Kristof of the new book "Tightrope," tells Ali Velshi that the narrative of personal responsibility over systematic inequality is fraught. WuDunn says we should all take social responsibility because inequality prevents the U.S. to compete against other countries.