The Q2 (July-Sep 2018) results are hard to analyse, due to the unusual activity during July-Sep 2017, a year ago. The GST (goods and services tax) was launched in July 2017 and it caused a period of serious disruption. It is possible to deseasonalise repetitive events like festivals with some confidence, due to data accumulation over many years. But GST was a one-off.
A look at the auto industry may be useful. In June 2017, carmakers cut down production due to the provision, that GST would not be available for left-over stock. Despatches in June 2017 were very low. In
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