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Open this photo in gallery: Flags of European Union, Germany, United-Kingdome, the United States of America, France, Canada, Italy and Japan during a meeting to prepare the G7 Summit in Biarritz on April 5, 2019.DAMIEN MEYER/AFP/Getty Images Calvin Goldman, K.C., is a former head of the Competition Bureau and practises law in Toronto. Thomas Mathews, of the Bars of Ontario and Quebec, practises law in Toronto. In response to concerns about Canadian productivity, businesspeople, economists and consumers have called for greater competition in major sectors such as telecommunications and airlines. However, the national-security sensitivity of these sectors also needs to...