Bloomberg writes that “EMarketer Inc., among the most widely cited sources for estimates of U.S. 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%.”

Here’s the explanation for the downgraded numbers:

“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.”

Founder-CEO Jeff Bezos has said that third party merchants “accounted for 58% of gross merchandise sales on the retail site” last year.

ZDNet reports that “IBM, KPMG, Merck and Walmart are teaming up to create a proof-of-concept blockchain network in partnership with the US Food and Drug Administration (FDA). The aim of the pilot program -- which is tied to the US Drug Supply Chain Security Act (DSCSA) -- is to help the FDA and other organizations in the drug supply chain in developing a blockchain network to identify and trace the distribution of prescription drugs … the companies hope to address multiple gaps in the current drug supply chain process, including the time it takes to track and trace inventory, the accuracy of data shared among members of the supply network, and the integrity of products in the distribution chain.”

The story notes that “Walmart has worked with IBM since 2016 to apply new levels of traceability based on blockchain technology across the food supply chain,” and currently is “in the process of implementing IBM's blockchain as part of new food safety requirements for its suppliers.”