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Here's an interesting look at a basic algorithm market makers could use to trade profitably. "Just buy the bid, sell the ask" becomes much more complex when it comes time to build the system in production:pic.twitter.com/xWq9qoWqsk
This paper is either nonsense or brilliant, because it never mentions the need for rebates to compensate the market makers for the risk of adverse selection caused by an HFT.
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