Filmmaker Ken Burns discusses the state of American gun legislation and his latest documentary, "The Vietnam War." Bob Profusek, a partner and head of M&A at Jones Day, says people within China's deal environment aren't worried about currency or regulation, but the attitude of the U.S. administration. Steven Barr, PWC's consumer markets leader, says physical retail may be stronger this holiday season. Finally, former Acting CBO Director Donald Marron says there's evidence that links tax cuts and economic growth, but it isn't as compelling as some think.