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How Markets Actually Work

Most beginner investing books skip the plumbing. They talk about which stocks to buy, never about what actually happens between the moment you click "Buy" and the moment shares land in your account. This book is the plumbing. It is the layer that decides whether you got a fair fill, whether your stop-loss will protect you in a fast market, and why the same trade costs different amounts at different brokers.

Who this book is for​

Anyone who already knows what a stock is and now wants to understand how the market behind it works. You do not need to be a professional trader. If you have placed at least one trade — or you are about to — you have everything you need. New self-directed investors, people moving from a robo-advisor to picking their own securities, and active traders who want to stop being mystified by their fills all get value here.

What you will walk away with​

By the end of this book you will be able to:

  • Trace the full path of a trade — your click → broker → router → exchange → matching engine → clearinghouse → your account.
  • Recognise every order type a retail platform offers and pick the right one for the situation.
  • Read a Level 2 order book without flinching.
  • Tell a market maker apart from an HFT firm and understand what each is paid to do.
  • Choose between an IPO, a direct listing and a SPAC as routes to public markets.
  • Short a stock with eyes open about borrow fees, recall risk and squeeze dynamics.
  • Use margin without blowing up your account.
  • Compare brokers on what actually matters: execution quality, margin rate, PFOF disclosure, SIPC coverage.

How the book is organised​

Fifteen substantive chapters plus a consolidated glossary. Chapter 1 follows a single trade end-to-end so the rest of the book has a frame. Chapters 2–4 cover the venues, order types, and order book — the language of execution. Chapters 5–7 cover the participants providing liquidity. Chapter 8 covers settlement and post-trade plumbing. Chapters 9–10 cover the edges of the trading day — extended hours, halts, and circuit breakers. Chapters 11–12 cover the corporate-action side: IPOs, secondaries, buybacks, splits. Chapters 13–14 cover short selling and margin — the two ways retail accounts most often blow up. Chapter 15 turns it all into a checklist for choosing a broker.

How to read it​

Linear works best for first-time readers. If you came in for one specific topic — say "what is PFOF" or "how does a short squeeze actually work" — go straight to that article; each one is self-contained. Use the glossary as a safety net for any unfamiliar term.

Start with What happens when you click "Buy" →