Preventing Algorithmic Collusion Act (S.232) — distribution to two or more in the same market presumes agreement under the Sherman Act, rebuttable only by clear and convincing evidence

1Moving the burden of proof

Proving collusion is held to be hard because the existence of an agreement must be shown. Where an algorithm mediates, evidence of people talking often does not exist. This bill moves that burden by placing a presumption that an agreement existed.

The presumption operates where an algorithm was distributed to two or more persons with the intent that it set or recommend prices in the same or a related market, among other cases. The starting point is not that anyone talked but that the same tool was handed to competitors.

2The conditions for rebuttal are set high

Overturning the presumption requires two things: that the defendant neither developed nor distributed the algorithm, and that it did not have actual knowledge and could not reasonably have known that nonpublic competitor data was used. The second must be shown to the high standard of clear and convincing evidence.

For the party that built the tool or handed it out, this route is not open at all. For a user, saying it did not know the contents is not enough. Not only is a presumption placed; how it may be overturned is finely designed.

3The reporting duty opens the contents

Section 3 requires a report within 30 days of a written request by the Attorney General or the Commission. What must be included is concrete: whether prices are set autonomously or with human review, what rules or processes produce a price, which data are used and from where and how often they are collected, and whether price discrimination occurs.

The design compels an explanation of a mechanism invisible from outside. Of the 114 AI-related bills this site holds as of 2026-09-01, sorting the 44 not yet covered by the leading verb of the official title gives establish at 11, require at 9, direct at 6 and amend at 6, while this is the only one beginning with prevent.

4Moving the burden of proof

Proving collusion is difficult because agreement has to be shown. Where an algorithm mediates, evidence of people conferring often does not exist. This bill places a presumption there.

1. 1Proving collusion ordinarilyAgreement itself has to be shown
2. 2Where an algorithm mediatesEvidence of people conferring often does not exist
3. 3Place a presumptionTake as the trigger that the algorithm was distributed to two or more in the same or a related market
4. 4Narrow the rebuttalShow, by clear and convincing evidence, no development or distribution and no actual or constructive knowledge that non-public competitor data was used

Those who built or distributed the tool have no route to that rebuttal at all. Those who used it cannot simply say they did not know what was inside. Section 3 requires a report within 30 days of a request by the Attorney General or the Commission, covering whether prices are set autonomously or with human review, and what data is collected, from where and how often.