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A hands-on options curriculum covering real trading concepts. Read the lessons, work through examples, and test your knowledge.

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Module 10: Auction Market TheoryBeginner 15 Min

Lesson 2: 10.1: The Continuous Auction Process

Understand how limit orders and market orders interact continuously to drive the auction cycle.

1. The Auction Mechanics

The continuous auction relies on the constant interaction of two groups of market participants: passive traders and aggressive traders.

• Passive Traders: Place limit orders on the order book (bids and asks). They represent the passive liquidity holding the market together.

• Aggressive Traders: Use market orders to buy or sell immediately. They are the active force that crosses the spread and moves the price.

★ Key Concept: The auction only moves when aggressive market orders consume all passive limit orders at a specific price level, forcing the auction to the next level.

2. The Directional Auction

If aggressive buyers dominate, they consume limit sell orders (asks) and drive the price up. The auction goes higher to advertise for sellers.

If aggressive sellers dominate, they consume limit buy orders (bids) and drive the price down. The auction goes lower to advertise for buyers.

A flow diagram with the boxes Market buy, Resting ask, Buy-side execution, Market sell, Resting bid and Sell-side execution
Two parallel flows. Top row: Market buy → Resting ask → Buy-side execution. Bottom row: Market sell → Resting bid → Sell-side execution. The orders shown cross against resting liquidity. Quotes can also move through cancellations and new limit orders, and not every price change uses up all the orders at a level.

KNOWLEDGE RECONNAISSANCE

Q01.

Which market participants are directly responsible for causing the auction price to move?

Signal Desk is where you practice this on real stocks: real option chains (about 15 minutes delayed), the Trade Check and a paper-trading account that risks no real money. Join to add it, your progress tracking and PDF downloads.

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