China and the U.S. accounted for more than 55 percent of global internet retail sales in 2014. China's growth over the next five years will widen the gap between the two countries. China will likely exceed $1 trillion (6,000,000 crore) in retail ecommerce sales by 2018, accounting for more than 40% of the total worldwide.

Globally, retail sales reached $22.492 trillion (134,952,000 crore) in 2014 but retail e-commerce sales stood at $1.316 trillion (7,896,000 crore, 5.9 percent of overall retail sales).

E-commerce sales are expected to increase 89 percent to $2.489 trillion (14,934,000 crore, 8.8 percent of overall retail sales) in 2018.

Digital-buyer penetration -- a measure of digital reach -- is a major factor in determining the success of retail e-commerce sales. India's digital-buyer penetration was quite low at 24.4 percent in 2014 as compared to the global average of 41.6 percent.

The UK leads the world with 88% penetration. Ironically, China with 55.2 percent and US with 74.4 perent penetration do not feature in the top five. Indian e-commerce has a long way to go.

"E-commerce in India still has a lot of friction," Rajnish said. "Till that is solved, it will be hard for penetration to go beyond 30 percent. For example, India has very low credit-card penetration and the cash-on-delivery (COD) model is why Flipkart really took off."

People above 35 are not very comfortable using their debit card online. PayTm and others solve this problem but there is a lot of friction.

"I use PayTm for Uber and it is still a process that has friction.In U.S., the return policy is very generous. I bought a coat from Amazon in the Bay area; it ended up being the wrong size. My experience of changing to the correct size was very seamless. When I bought a down jacket in Bangalore, and it ended up being the wrong size, getting the right size was really a painful experience," said Rajnish.

That view is echoed by Paritosh Sharma, an advisor to tech startups and an entrepreneur with PayUMoney, a digital-payment platform.

"Digital buying has an attached expectation to it. I place the order and it should appear in front of me over the next two or three days. In many cases this does not happen. Also, in a lot of cases (especially in Tier-2 and Tier-3 cities) in India, if you get a product that is not of the exact quality that you ordered, returning it is a major problem. Most people, hence, prefer what's available in a physical retail store," Sharma said.

There are two more reasons for low online sales, said Sharma. First, the internet infrastructure in India is poor. If one steps outside city limits, you automatically are shifted from 3G to an Edge (a lower-speed) connection, deterring buyers.

Second, lack of good service and support. While most Indian e-commerce companies are sprucing up their support via phone and digital media, it's quite haphazard. Most companies still lack processes to ensure customer satisfaction and trust

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