The US's top three trading partners China, Canada and Mexico are rolling out retaliatory levies on a wide range of products.  Observers say the tit-for-tat moves have consequences for consumers, economies and financial markets. Does this spell the beginning of a trade war? Andrea Heng and Hairianto Diman find out from Dr John Donaldson, Assoc Professor of Political Science, School of Social Sciences, SMU

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