medium · Market Microstructure hft

A large sell order of 75,000 contracts is placed in the E-mini S&P 500 futures market using a VWAP algorithm. As prices fall, HFT firms engage in 'hot potato' trading, rapidly passing contracts back and forth.

How does the algorithm's reaction contribute to a potential flash crash?

  1. It switches its execution logic to a slower TWAP schedule, spreading the order evenly over time.
  2. It reduces its selling rate to avoid creating excessive market impact costs.
  3. It halts all trading immediately once the LULD circuit breaker bands are triggered.
  4. It increases the selling rate because the reported market volume is artificially inflated.

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