Radius-TWC has closed its fourth deal of Sundance, picking up Jacob Kornbluth’s documentary “Inequality For All,” which was produced by Jennifer Chaiken and Sebastian Dungan. Pic follows noted economic-policy expert Robert Reich as he distills the topic of widening income inequality and addresses the question of what effects this increasing gap has on our economy and our democracy. Pic premiered Saturday at Prospector Square as part of the U.S. documentary competition. Radius-TWC, led by Tom Quinn and Jason Janego, picked up “Lovelace” last night following a post-screening negotiation in the Eccles lobby. It also picked up Morgan Neville’s documentary “20 Feet From Stardom” and Stacie Passon’s “Concussion.” WME negotiated the deal on behalf of the filmmakers.