Lock Limit

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What this video covers

  • The precise definition of a lock limit (locked limit, limit-locked market): price pinned at the daily limit with no counterparty, so zero trades match
  • Why the order imbalance causes the lock, not the daily limit itself, and how a contract can trade at the limit forever if both sides remain willing
  • Locked limit up: massive buyer wall at the ceiling, no sellers, and the short who needs to buy back to offset is trapped
  • Locked limit down: massive seller wall at the floor, no buyers, and the long who needs to sell to offset is trapped
  • What being "locked in" means for the trader on the losing side: unable to close the position while losses continue running
  • The only two ways relief occurs: the imbalance eases and a counterparty appears, or the exchange expands or removes the limit
  • Why meeting a margin call does not unlock the market: it only keeps the account funded, but does not create the counterparty needed to close the position

Read the full lesson, free

This video's complete written lesson is free to read in the CertFuel app, no signup wall. The complete Series 3 course also includes adaptive practice questions and spaced-repetition flashcards, free through the end of 2026.

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