Author and legal scholar Cass Sunstein of Harvard University talks with EconTalk host Russ Roberts about his latest book, #Republic. Sunstein argues that the internet has encouraged people to frequent informational echo chambers where their views are reinforced and rarely challenged. In addition, there is a loss of public space where people might have to encounter dissonant ideas or causes they might wish to champion. Sunstein considers this a threat to democracy and discusses a variety of ways the situation might improve.