From Paris to San Bernardino, terrorist attacks have sparked an outcry from many politicians in Europe and the U.S. - including calls for new controls on immigration, refugees and the free movement of labor across national borders.

The leading Republican Presidential candidate, Donald Trump, called for a total and complete ban on Muslims entering the United States.

Our guest in episode 29, Peter Coy, Economics Editor for Bloomberg Businessweek, makes a strong case for more - not less - immigration, as well as a greater exchange of ideas across the boundaries that divide us.