Definition

Market Order

An order that executes immediately at the best available price. This is aggression.

Full Explanation

A market order is impatient. It does not name a price — it demands execution right now and accepts whatever price is currently available. A market buy hits the ask. A market sell hits the bid. Market orders are what aggression is made of. The difference between a limit order and a market order is the difference between providing liquidity and consuming it. Every time you click buy or sell at market, you are the aggressor — and you are accepting a price that was set by someone else's patience.

In the Book 1 chapter

Chapter 2 · The Mechanics

Liquidity and Aggression

Every single trade has a buyer and a seller. That’s not an insight — it’s just math. For any transaction to happen, someone has to buy and someone has to sell. Which means that when you hear “buyers are in control right now” or “sellers are pushing price down,” you should pause for a second, because those phrases are telling you less than they sound like they are.

From the Blog 1 post

Why "Buyers vs. Sellers" Is the Wrong Frame

Every transaction has both a buyer and a seller. That's not insight — it's arithmetic. The question that actually matters is different, and until you're asking it, you're working with the wrong map.

Videos 1 video

Stop Saying "Buyers and Sellers" — Start Saying Liquidity and Aggression

Two people can both be buyers and be doing completely different things in the market . The key is not buyers vs sellers, it is understanding liquidity and aggression.