Recent threats to impose tariffs on Chinese goods, coupled with China's own retaliatory announcements have raised the prospects of a trade war between the world's two biggest economies. But what is a trade war, and what would be the economic ramifications if there were one? Brad Setser, the Steven A. Tananbaum senior fellow for international economics at the Council on Foreign Relations, joins us on this week’s Odd Lots to help answer those questions. Brad has been writing about trade issues for many years, and explains what exactly we're seeing now, how the current trade actions differ from standard moves on trade, and where ultimately all these actions might go.