New Delhi, Aug. 2 -- US President Donald Trump's latest rattle of a big sabre in the ongoing trade battle with China involves a risky gamble. In a series of tweets, he has threatened to impose a 10% tariff on Chinese imports worth $300 billion, to be brought into effect from 1 September. He had erected trade barriers against steel and aluminium imports earlier, but those are industrial inputs. This would be the first time that products found in supermarkets and the like are priced up-or off shelves entirely-by his policy. Consumer electronics, apparel, furniture and a vast variety of manufactures would be covered by the new measure....