medium · Order Flow Analysis market-mechanics-execution

What happens to the bid-ask spread immediately after an aggressive buy order 'walks the book' and consumes the first two offer levels?

  1. The spread remains constant due to high-frequency trading (HFT) algorithms.
  2. The spread widens until new limit sell orders are placed at lower prices.
  3. The spread narrows.
  4. The bid price automatically adjusts upward to match the new offer.

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