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Conscious parallelism is a term from antitrust law. It's when competitors watch each other and adjust prices accordingly. As in the old gas price wars that rages many years ago, where folks would watch each other and mimic prices from across the street. As I understand it (not an expert), conscious parallelism is legal, as long as competitors don't "agree" to it.
Your suggestion about clearing cookies is an interesting one. I opened up Safari and cleared the cookies, then went to amazon and didn't sign in. Roomba i7 shows at $699.00. Then signed in as me. Still $699.00.
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