Ignoring the typo, which makes me completely confident in their ability to accurately report on these events, the claim is: that price fixing / collusion happened.
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Their evidence: "Yesterday, the Federal Trade Commission released evidence confirming that collusion played a serious role in hiking oil prices at that time."
They claim that the FTC has evidence of collusion, and they link to a release from the FTC.
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The FTC evidence: "The Federal Trade Commission took action to resolve antitrust concerns [..] the proposed consent order seeks to prevent Pioneer’s Sheffield from engaging in collusive activity that would potentially raise crude oil prices"
So .. they took action to resolve "concerns", to be preventative so that "collusive activity" that could "potentially" raise prices doesn't happen, in the future.
"The FTC alleges in a complaint that Sheffield has, through public statements and private communications, attempted to collude" .. "Sheffield sought to align oil production"
So .. he "attempted" to collude, he "sought" to collude, or he did collude?
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So, to summarize, the evidence uses wording like "concerns, prevention, in the future, attempt", but nowhere states that anything actually DID happen, whereas the author of this article interprets that as evidence that it absolutely did happen?