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Stock Market Basics — Lesson 2 of 4
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How Trades Are Executed

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Key Takeaways

  1. 1A stock trade isn't instantaneous — execution feels immediate but settlement (T+1) takes a full business day through a clearinghouse like the DTCC
  2. 2Your broker has a regulatory 'best execution' duty — they must seek the most advantageous terms, balancing price, speed, and likelihood of fill
  3. 3Orders can route to multiple venues: stock exchanges, market makers, broker internalization, or ECNs — depending on execution quality
  4. 4Order type fundamentally changes what happens next: market orders execute immediately, limit orders wait in the book for your price
  5. 5Market makers earn the bid-ask spread for providing liquidity — they're the reason there's almost always a counterparty when you click trade