Price is a result of orders meeting
In a central limit order book, buyers post bids and sellers post offers at different prices. The best bid is the highest displayed buying price; the best ask is the lowest displayed selling price. The difference between them is the spread. When compatible orders match, a trade occurs and the exchange updates the book.
Many charts use the last traded price, but some show bid, ask, midpoint, mark or index prices instead. Before interpreting a level—or judging whether an order should have filled—check which price series the platform displays.
Every trade has two sides; initiative can differ
Each executed trade has both a buyer and a seller for the same matched quantity. So saying “there were more buyers than sellers” does not explain the transaction. A more useful question is which side crossed the spread and consumed the resting order.
A resting limit order on an exchange can add liquidity to the book. An incoming order that matches against it takes liquidity. A market order usually seeks immediate execution, while a marketable limit order can also take liquidity if its price crosses the best available quote. The exact labels and behavior depend on the venue and order type.
They describe how an order interacted with a particular venue at execution time. They do not reveal the trader's full intention, identity, or view of the market.
Why the same order can have different price impact
An aggressive buy can execute against the best ask and then continue through higher offers if its size exceeds the quantity available at each level. An aggressive sell can do the same against bids. The result depends on order size, available depth, spread, quote replenishment, hidden or off-book liquidity, and market conditions.
Displayed depth is only a snapshot. Orders may be changed or cancelled, and a thin visible book does not by itself prove that the market cannot absorb trading. A better assessment looks at execution quality and price impact alongside volume and depth.
What market makers do—and what a chart cannot show
In an exchange order book, liquidity providers may quote both sides and manage the risk of the inventory they accumulate. When uncertainty or adverse-selection risk rises, they may change prices, reduce displayed size or widen quotes. Other participants include hedgers, investors, arbitrageurs, short-term traders and automated strategies. Their goals can overlap.
This does not mean that one market maker directs every move. A public chart or order book does not reveal every participant's inventory, hidden interest, or reason for trading. Quote changes can affect available liquidity, but they are only part of a larger interaction.
Consolidation, fast moves and reversals
Price may stay in a range when buying and selling pressure are relatively balanced and liquidity is replenished near the current market. A fast move can occur when incoming orders meet limited opposing liquidity, when quotes change quickly, or when news and position exits intensify activity. Volume alone does not tell us which situation is in control; it needs context.
“Price moves where resistance is lower” can be a useful shorthand: it may travel more quickly through areas with less available opposing liquidity. It is a heuristic, not a law or a forecast. A reversal is not guaranteed just because price reaches a line on a chart; the response depends on orders and participants that may not be visible.
A candle gap or chart “imbalance” is also a charting description, not proof that the market has an empty zone. Its interpretation depends on the instrument, venue, data feed, session and chart interval.
Use the model as a checklist, not a prediction
- Identify whether the chart shows last trade, bid, ask, midpoint or another reference price.
- Separate executed volume from resting orders and ask which side initiated the interaction.
- Compare order size and spread with available liquidity; visible depth alone is incomplete.
- Check the venue: exchange-traded futures, spot crypto and retail FX/CFD feeds can have different execution mechanics.
- Define the invalidation point and maximum loss before turning an observation into a trade.
The order-book model helps explain how price can move. It cannot reveal every hidden order or reliably tell what the next candle will do. Use it to frame questions and execution risk, not to manufacture certainty.
Further reading
- CME Group: Reassessing Liquidity Beyond Order Book Depth — why displayed depth alone is an incomplete liquidity measure.
- CME Group: The Limits of Limit Orders in Retail FX/CFD Trading — how broker-held FX/CFD instructions differ from exchange order-book orders.
This guide adapts the supplied interactive lesson and narrows several broad claims to reflect venue-specific market mechanics.