Germany’s anti-trust watchdog is investigating whether Amazon has exploited its market dominance.
The Federal Cartel Office said it would rule on whether the online marketplace had had an “almost unchallenged position of economic power”.
New German laws allow regulators to prohibit any anti-competitive behaviour at an earlier stage.
An Amazon spokesman told BBC News it did not comment on continuing proceedings and was co-operating fully.
The Federal Cartel Office is already investigating Amazon’s:
relationships with traders on the platform
“In the past few years, we have had to deal with Amazon on several occasions and also obtained far-reaching improvements for sellers on Amazon Marketplace,” its head, Andreas Mundt, said.
“In this particular case, we are first of all examining whether Amazon is of paramount significance for competition across markets.
“An ecosystem which extends across various markets… is particularly characteristic in this respect.
“This could apply to Amazon, with its online marketplaces and many other, above all digital, offers.”