# Reading Liquidity: What Order Book Shape Tells You

URL: https://www.caijing188.com/order-book-shape/
Published: 2026-10-27T22:56:38+08:00 | Updated: 2026-10-27T22:56:38+08:00
Verified: 2026-10-27

## Quick answer
Order book shape is the profile of resting bids and asks across price levels. It prices your order at your size, while turnover only describes trades that already happened.

## Summary
Order book shape describes what is still available right now, while volume only counts what already traded. Here is how to measure depth at your own order size.

## FAQ
Q: Does a deep order book mean the price will not move?
A: No. Depth only describes the cost of trading a given size at one instant. Orders can be cancelled, and a large enough trade clears any book. Depth cuts slippage for a specific quantity; it says nothing about where price goes next.
Q: Why does the book look deep on one exchange and thin on another for the same pair?
A: The two books are separate inventories run by different makers with different fee schedules, hedging routes and risk limits. Aggregated depth is not additive unless you can actually route to every venue at once.
Q: Is a wide spread always a sign of a bad market?
A: Not necessarily. A wide spread can reflect high volatility, low maker competition or thin reference pricing. What matters is whether it is wide against that pair's own history.
Q: How can I tell if the depth is real?
A: You cannot tell with certainty, because resting orders can be pulled. A reasonable proxy is to watch whether the same levels persist across several snapshots and whether trades actually print there. Levels that survive an hour and get hit are more credible than levels that appear and vanish.
Q: Does a large bid wall mean support?
A: No. A wall is an order, not a commitment, and it can be cancelled the moment it becomes inconvenient. Treat a large single level as one participant's current intent, not a floor under the price.
Q: What is the single most useful book metric?
A: Cumulative depth within a fixed distance of the mid, measured at your order size. It converts the shape into a cost you can compare, and it beats turnover or the top-of-book spread on decision value.