Those worried about the economy could go whistle. India’s chief economic adviser Arvind Subramanian has screamed happiness. It’s got to do with India’s “historically low” consumer-price inflation. Retail inflation -- the shop-end prices you and I pay for all that we buy – has come in at 1.54 per cent for June 2017, a record low. It’s a “heartening number”, he said, going on to subtly chide all those who missed this fundamental shift. That was a rare personal Twitter “statement”. Did he go overboard with his exuberance?