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📘 How Stock Exchanges Work

You place an order through a broker. The exchange does not pick a price for the company — it matches buy and sell interest under published rules.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The order bookExplain exchanges, order books, limit and market orders, and price-time priority.Venues store bids and offers, then match them by competitive price, time, and order instructions.
  2. Liquidity and spreadsDescribe market makers, bid-ask spreads, and inventory risk.Market makers quote both sides, take temporary positions, and manage the risks of providing immediacy.
  3. AuctionsExplain opening and closing auctions and imbalance indications.Auctions concentrate orders to discover reference prices under venue-specific allocation rules.
  4. Routing and tradesTrace broker routing, execution, and public trade reporting.Routing selects a venue, matching creates a fill, and a trade print records one moment in a continuing market.

Questions this course answers

What does an electronic order book primarily contain?

The order book stores eligible buy and sell interest, including prices and quantities that may later match.

What usually comes first in price-time priority?

A higher bid or lower offer is generally more competitive, and equal-priced orders are commonly ranked by time.

Why does a market maker face inventory risk?

A market maker may hold a position after filling someone else's order, and that position can gain or lose value as prices change.

What is a key purpose of an opening or closing auction?

Auctions gather interest and cross it under published rules, often creating a shared opening or closing reference price.

What does a single trade print tell you?

A print records one completed match; it does not describe every quote, route, or future market move.

Grounded in trusted sources

  • U.S. Securities and Exchange Commission, Market Centers: Buying and Selling Stock: https://www.sec.gov/answers/market.htm
  • U.S. Securities and Exchange Commission, ECNs/Alternative Trading Systems: https://www.sec.gov/divisions/marketreg/mrecn.shtml
  • NYSE, NYSE Equities: https://www.nyse.com/trade/equities
  • NYSE, NYSE DMMs: Meeting the Volatility Challenge: https://beta.nyse.com/data-insights/nyse-dmms-meeting-the-volatility-challenge
  • Nasdaq, Demystifying the Central Limit Order Book: https://www.nasdaq.com/articles/demystifying-the-central-limit-order-book-clob-everything-you-need-to-know
  • FINRA, Notice to Members 06-03: Market Order Protection: https://www.finra.org/rules-guidance/notices/06-03
  • Wikimedia Commons API image records: https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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