Amazon Online Market Share in the US Drops to 38 Percent: eMarketer

eMarketer is among the most widely cited sources for estimates of US online retail sales.

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Amazon Online Market Share in the US Drops to 38 Percent: eMarketer

A closely watched researcher has cut its estimate of's share of the US e-commerce market after incorporating new figures from the company.

eMarketer, among the most widely cited sources for estimates of US online retail sales, says it now expects Amazon to account for 37.7% of online commerce this year, down from a prior estimate of 47%. The new market share numbers were reported earlier Thursday by the Information.

An Amazon spokesman said eMarketer reached out to the company's analyst relations group after Chief Executive Officer Jeff Bezos disclosed that independent merchants accounted for 58% of gross merchandise sales on the retail site - the first time the company had made that metric public.

eMarketer's revision comes as Amazon, along with Alphabet's Google, Facebook, and Apple, face calls for an examination of their market power. Regulators in recent weeks divvied up antitrust oversight of the four companies, a sign to some observers that formal inquiries could be forthcoming.

Amazon downplays its market size, saying it represents 4% of total retail spending in the US. Some of its critics say it's important to consider the company's clout specifically in e-commerce since spending online is growing at triple the pace of overall retail.

In a veiled riposte to would-be trustbusters, Bezos disclosed the percentage of gross merchandise sales from merchants in a letter to shareholders in April. "Third-party sellers are kicking our first-party butt. Badly," he wrote.

An eMarketer spokesman said the company based its updated forecast on the disclosure in Bezos' shareholder letter, and didn't receive any exclusive information from Amazon.

Estimating Amazon's scale is difficult because it isn't simply a retailer but also operates in an array of different markets, including devices, cloud computing, streaming services and more. Measuring its e-commerce market share is hard, too, because the company is both a traditional retailer and online consignment shop.

Amazon buys products wholesale and sells them directly to consumers like a typical retailer. For those transactions, Amazon reports the entire purchase price as revenue. But for transactions generated by third-party merchants, the company only records the fees and commissions it charges them. EMarketer estimates market share based on consumer spending, not Amazon revenue, so all the money shoppers spend on Amazon is counted toward its market share.

eBay discloses the total amount of money shoppers spend on its marketplace, almost $90 billion in 2018. Amazon does not, so independent firms like EMarketer must estimate it.

© 2019 Bloomberg LP


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