San Francisco (CNN Business) Amazon sellers just got a little more freedom.

The e-commerce company will no longer prohibit its third-party sellers from listing their products on other sites for less than they do on Amazon's US site.

The change comes amid concern that the stipulation, called price parity, could be in violation of US antitrust law.

Amazon AMZN confirmed the policy change, which took effect Monday, but would not comment on it.

Senator Richard Blumenthal had called previously on the Department of Justice and the Federal Trade Commission for an investigation into antitrust violations and how they could affect the prices that consumers pay for goods.

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