The Bombardier-Boeing dispute goes to the heart of the debate over what constitutes state aid and price dumping

In recent weeks the US Department of Commerce has threatened to slap a 220 percent tariff on to sales of C-series jets manufactured by the Canadian company, Bombardier. Boeing has alleged that Bombardier - which also employs thousands in Northern Ireland - has received generous state aid from the Canadian government, and is selling its jets below cost. Hervé Morvan ...