peter mauricie from the university of maryland. how should we do the math as campaign wears on? >> the candidates have increasingly made trade a center of their argument about what the united states should be do going forward. how should we understand the arrangements we have made for doing business? >> there is no doubt that trade is not an all up or downside. netting out the benefits, we are a major economy in a global economy and the benefits outweigh the harm done to a cadre of workers. i think the real problem is we haven't made the public policy choices that we need to make to help those workers that are hurting. and i think we have done that in a very erratic and episodic fashion but as a government, both the executive and legislative branch haven't taken serious lee those workers who have been harmed, really harmed and decided here are the public policy choices we are going to make to help them to help them transition rapidly back to a changing labor market. i think the argument that mr. trump has made to shut down all trade or to institute barriers and tariffs and fines