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Amazon’s letter does not directly address one of the key points of the Wall Street Journal article: that aggregate sales data is effectively single-seller data when one seller is dominant. The company has said in the past that the aggregated report would not reveal to an employee how many sellers are included in the aggregation.

American filmmaker Dodge Billingsley, an avid collector of China's Social Realism Art, talks about his collection in his office in Salt Lake City, Utah. May Zhou/China Daily

Amazon’s Prime Air “Delivery Drone.”

Amazon’s smart assistant is getting to know?your neighborhood. Amazon has?added Yelp results to Alexa’s answers so?you can now ask your Echo about local restaurants and stores.

Amazon’s Echo virtual-assistant-in-a-speaker received a small update today that improves the service for sports fans and music fans. People who enjoy streaming music from Pandora’s radio service can now start up a radio station just by speaking to their Echo.