Who moves the price, and who holds it
Last time I promised to break down how price actually gets made. Without that, everything that follows — absorption, delta, imbalance — stays just words.
At any given moment the market has two types of participants, and they do opposite things:
| Participant | What it does |
|---|---|
| Limit order (passive) | places an order and waits: "I'll sell at this price, whoever wants it can take it." Sits and holds. |
| Market order (aggressor) | doesn't wait — takes right now, at whatever price is available. |
And here's the whole point: only the aggressor moves the price. When an aggressive buyer clears out all the sell orders at their level, price moves up, to the next orders in line. No aggressor — no movement, no matter how many limit orders are sitting there.
⚠️ Remember: someone takes at market, someone holds with a limit. Everything that follows is built on how these two orders connect.
The exchange as: a supermarket, a pawnshop, and a cashier
If that sounds abstract — picture an ordinary non-grocery marketplace, one aisle full of tech goods: on the right, electronics supermarkets selling phones; on the left, pawnshops buying phones.
The supermarket seller has laid out phones and hung up a price tag: a hundred dollars each. He's not grabbing anyone by the sleeve — he just stands there and waits for a buyer. That's a limit sell order: goods at a stated price, whoever wants them can come get them. Meanwhile the pawnshop owner has put up a sign: ready to buy your phone for 90 dollars.
You walk into the supermarket with cash: "I'll take a phone, here's the money." No haggling, no waiting — you take it at whatever price is posted. That's a market buy order. Then you head to the pawnshop: "I want to sell my phone" — and again, you're not picking the price, you're accepting the terms. That's a market sell order.
The ones standing behind the counter (supermarkets and pawnshops) and the ones walking in with "urgent" plans together make up the ongoing trading process — on an exchange this is called the matching engine, the mechanism that matches orders. And at every checkout there's a cashier recording the trade, printing a receipt, and logging every detail of the deal into the database, including time, price, and quantity.
In essence, an exchange is the same marketplace, just with thousands of sellers and buyers, and a cashier processing thousands of trades a second. And once the hundred-dollar phones run out, the next seller in line is already standing there with a price tag of a hundred and five, then a hundred and seven, and so on. Price went up not because "the market went up" — but because aggressive buyers cleared out all the inventory at the nearest price levels.
How trades come together into a single candle
Now for the most important part. That candle you're looking at isn't a single object. It's a record of every "seller — buyer — cashier" trade over a stretch of time, compressed into one rectangle.
Let's build one candle in slow motion:
- Open — the first market buys clear out orders, price crawls upward.
- Move toward the high — buyers aggressively take level after level.
- The top — a large seller shows up: places a big limit order and calmly hands out inventory to everyone rushing to buy. Buyers keep hitting it, but price doesn't move — he absorbs all that pressure. This is absorption.
- Close — the push runs out, there are no more buyers up top, price slides back down. The candle closes below the high, with a long upper wick.
That's the life of a single candle. And now it's clear why Footprint matters: it's the same candle, just not compressed — you can see every level and how much traded on each side.
The two numbers in a cluster row are "how much was aggressively bought here" and "how much was aggressively sold."
Matching Engine, step by step
We built a simulator specifically for you to help you work through order matching step by step.
- On the left, the Order Book — the exchange order book with limit orders, red on top representing our supermarkets selling phones, green below representing pawnshops buying phones.
- Time & Sales in the center — that's you and me walking through the market's aisles: I'm selling the phones I have, and you're buying one for yourself at the supermarket. By market rules we can't officially trade directly with each other, so we're left going into supermarkets and pawnshops and accepting their posted prices.
- On the right, the cluster chart builder, where you can see how the market's cashier files the information about our actions into the correct columns of the candle, at the correct prices.
Market BUY 15 — eats through the first three ask levels
Next: Market BUY 15
Order Book
Time & Sales
Footprint
Click Next and you'll see a purchase (Side B) in Time & Sales — 5 phones at 5525.00 each. On the left, the Order Book shows you buying out all the phones at that price from the supermarket.
Now that price is gone — if you want to buy more phones, you'll have to buy at 5525.25, at a different supermarket.
Click Next again and you buy 8 more phones at a new price at another supermarket. On the left, the Order Book has emptied out one more supermarket. And so on.
At the very end, you can decide to sell off 8 of the phones — but you'll only be able to do it at a much worse price than what you bought them for, 5524.75, because that's the best offer across all the pawnshops, and if you want to sell right now, you have to accept it. Given that your last purchase was at 5525.75, you're down 1 dollar on every phone — not a great trade, but we'll get into how to make a trade profitable later.
The minimum path to your first trade
You might be looking at the course structure and thinking: "good grief, that's a lot, when do I actually start trading?" I know the feeling — I used to grab at everything at once and ended up applying none of it. Here's the minimum path you can actually put into practice:
- Module 1 — the foundation: remember the pricing principle, and that Footprint highlights the actions of aggressive sellers and buyers. This is what you need to understand the market's tug-of-war and spot who's winning and who's losing.
- Lessons 2.1–2.2 — diving into Footprint: reading the anatomy of a bar and buyer/seller actions.
- Lessons 2.3–2.4 — Volume Profile: seeing where the market's fight actually happened. In the marketplace analogy — understanding what a genuinely good phone price is, when to sell what's piled up, and when to buy it up.
- Lessons 3.1–3.5 — Volume Profile analysis fundamentals: theory for finding zones and reversals, and breaking down trading setups combined with Footprint.
- Lessons 3.6–3.7 — Footprint combinations across timeframes: blending a higher and a lower timeframe into a single decision-making sequence.
- Module 4 — example exercises and Market Replay to work through them, plus common mistakes, how to avoid them, and what to do if you've already made one.
After that come lesson 3.3 (multi-timeframe: analysis and finding an entry point on a single instrument) and lesson 3.4 (position management and risk management — the glue holding trader and strategy together). Those can comfortably wait until after your first runs in Replay.
Knowing three things and doing them every day beats knowing everything and doing nothing. For the first two weeks you don't need every Footprint mode, multi-timeframe analysis, CVD divergences, and tape-reading stops all at once. Just two tools — Footprint and Volume Profile — and the workflow from lesson 3.2. Everything else will fall into place once you've got some practice under your belt.
Coming up: you're now holding the mechanics in your head — who takes at market, who holds with a limit, how a bar gets built out of that. Time to turn it into a concrete number. Delta — a single number that tells you who was pushing harder inside a bar, the buyer or the seller. That's where reading a cluster begins, and the next module.