According to an SBI Research report, the e-retailing, which comprises online retail and online marketplaces, has become the fastest-growing segment in the larger market having grown at a CAGR of around 56 per cent during 2009-14.
The e-retail market was around USD 6 billion in 2015.
"Our research indicates that only by considering the discount prices and that too for a select group of products, CPI inflation would be at least 25 bps lower that the actual CPI numbers," SBI Research said in its Ecowrap report.
"A potential source of bias can arise when shifts to lower price discount outlets are inadequately reflected," the report said.
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Books, apparel and accessories and electronics are the largest selling products on the online retailing platforms, constituting around 80 per cent of the volume.
"The increasing use of smartphones, tablets and broadband and 3G/4G has led to developing a strong consumer base which is likely to increase further. So, there is a need to include the prices charged by the e-retailers like Flipkart, Snapdeal, Amazon etc, while calculating the CPI index, and if done so there may be a downward bias," it said.