How Price Moves
Trading Mastery
9 min read
Learn why price changes occur at the micro level through aggressive market orders consuming resting liquidity at the best bid and ask.
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9 min read
Learn why price changes occur at the micro level through aggressive market orders consuming resting liquidity at the best bid and ask.
Everyone talks about "supply and demand" as if it’s some invisible force. But in a real market—on your screen—price moves for a very specific reason:
Because someone placed a market order.
Not because of news. Not because of predictions. Not even because someone wants to buy or sell. Price moves when someone actually does buy or sell—by placing an order that crosses the spread.
In this post, we’ll break down:
Let’s start simple:
For example, if:
That trade becomes the new market price.
Limit orders sit and wait. They don’t print price by themselves — but they are the price ladder. They define every level a market order can land on, and the cost of taking liquidity is the shape of that ladder.
But market orders? They’re aggressive. They say:
"I want in NOW, and I’m willing to accept someone else’s price."
And that’s what shifts the market.
Example: Let’s say the order book looks like this:
| Price | Amount | Type |
|---|---|---|
| 63,800 | 1.5 | Ask |
| 63,700 | --- Mid --- | |
| 63,600 | 1.2 | Bid |
If a buyer places a market order to buy 1 BTC:
If another buyer comes in and buys 2 BTC with a market order:
This is called "sweeping the book." The more liquidity they take, the more price moves.
In markets, people often confuse interest with pressure.
| Concept | Description |
|---|---|
| Supply | People wanting to sell |
| Demand | People wanting to buy |
| Aggressive supply | Market sell orders hitting bids |
| Aggressive demand | Market buy orders hitting asks |
Price doesn’t move because people want to buy or sell. It moves because they’re willing to hit someone else’s price right now.
Understanding what moves price helps you:
"The news is good, so price will go up."
Not unless buyers are actually buying aggressively.
"There’s lots of buy orders below, so we’re safe."
Those bids can be pulled instantly—nothing is guaranteed.
"A whale just placed a big order."
Was it a limit order or market order? Only market orders move price.
Absorption is the opposite picture: aggression keeps hitting a level, but price does not move. Someone is replenishing resting size as fast as it gets eaten. Absorption near a key level is often more informative than the breakout that follows it.
Caveat. Reading order flow is a probabilistic skill, not a signal. Plenty of clean-looking aggression dies into absorption, and plenty of absorption breaks. Treat what you see as evidence, not as a setup — and never size as if you're sure.
Open any liquid pair (BTCUSDT works). Watch the tape for 10 minutes. Mark five prints that crossed the spread; tag each as buy-aggressing (lifted the ask) or sell-aggressing (hit the bid). Note which ones moved the best price and which ones got absorbed.
No. Limit orders sit at a level and wait. They only define where price can print; they don't print it themselves.
A single aggressive order that consumes multiple resting levels in one trade, lifting (or dropping) the last price by the depth it ate.
Because the book was thin at that moment — small aggression met small resting size, so each unit of flow moved price further than it would in a deep book.
Adjust the volatility slider to see how larger price swings create wider candle bodies and longer wicks. Toggle volume bars to see how volume correlates with price movement.