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A comment on The High-Speed Trading Behind an Amazon Purchase. Parent comment

Re:The High-Speed Trading Behind an Amazon Purchase by supergreg on Monday March 27, 2017 @09:18AM (#13967448)
In my grocery store they give you 50% discount after 8pm. No need to change price labels.
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Re:The High-Speed Trading Behind an Amazon Purchase by thinkloop on Wednesday March 29, 2017 @03:04AM (#13984035)
How do people know?
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