Amazon may face a new probe in Germany - its second-biggest market.
"We are now investigating whether and how Amazon influences the price-setting of third-party traders on the marketplace", Andreas Mundt, president of BKA was quoted as saying by the Frankfurter Allgemeine Zeitung newspaper, which was the first to report the investigation.
His office was reacting to complaints that the US tech giant blocked individual sellers because they allegedly charged excessive prices during the first months of the coronavirus crisis.
While that might sound good to consumers, cartel investigators say Amazon has no business controlling prices.
The cartel workplace was not instantly readily available to comment.
An Amazon spokeswoman refuted the allegations, claiming, the company's "systems are created to take action against price gouging".
She added, "Our systems are created to take action against price gouging".
An Amazon spokeswoman defended its policies with regard to price gouging and redirected any concerned customers to the company's support team.
Past year it reached a deal with German authorities over its treatment of third-party merchants, ending a previous seven-month investigation.
Amazon said it does not access sales data from independent sellers to help develop its own products.
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