At least three merchants have been asked to share how much of their revenue comes from Amazon versus its rivals, like Walmart and eBay. Amazon declined to comment. The interviews have lasted around 90 minutes each and covered a wide range of issues. (Bloomberg)

Talking point: This is one of the first indications that Amazon could be facing a formal antitrust investigation in the U.S., after a June report that the FTC and the Justice Department were dividing up tech companies to investigate. Amazon, which is the world’s largest retailer, has largely avoided the scrutiny faced by other Big Tech firms, like Facebook and Google. Both firms are facing multiple antitrust probes around the world. The concern for Amazon would be whether it puts third-party merchants, whose goods make up the majority of products on its marketplace, at a disadvantage. In August, Joe Simons, FTC chair, told Bloomberg he wanted to hear from third-party merchants, whose goods make up the majority of products on Amazon’s marketplace, on whether they felt Amazon was punishing them for offering lower prices for their products on its platform.