U.S. President Donald Trump rode to power declaring that China had twisted the world trading system out of shape -- and plenty of people around the world murmured in agreement, if very quietly. The first shots in Trump’s trade war, however, have been indiscriminate. His steel and aluminium tariffs are the equivalent of firing into a curious crowd of onlookers. This is a terrible idea for many reasons, not least because every member of the crowd is armed.
On Thursday, it was India’s turn to shoot back. Tariffs were raised on the usual complicated list of imports from the U.S.,

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