Lesson 3: The Order Book and Why It Matters

The order book is a list of all limit orders to buy (bid) and sell (ask) available on the market at the moment. 
With it, a trader can see the current levels of supply and demand. It is an important tool for assessing the current activity and mood of market participants.

Reading the order book and assessing market depth.
By looking through the order book, a trader can see which price levels hold the most limit orders, which helps understand where the price may pause or bounce.
Example: Imagine the price of Ethereum (ETH) is at $1,800.
In the order book you see a large limit order to buy at $1,750 that significantly exceeds the volume of the other orders.
This level becomes a support zone, because a large number of buy orders can prevent a further price drop even if sellers are active.
If the price starts to fall and approaches $1,750, the probability that it will stop or reverse from this level is higher, because the large order creates a "barrier" for sellers.

Market depth reflects the number and distribution of limit orders at different price levels.
The more orders are concentrated at certain levels, the more stable the price will be at those levels.
A deep market can indicate that at certain levels the price will run into strong resistance or support, which helps you forecast the move more accurately.

 Support and resistance in the order book: Support and resistance levels can often be identified by watching where orders are concentrated.
Levels with a large number of buy orders (support) and sell orders (resistance) play a key role in price movement, since breaking through them requires high trading activity. Example: Suppose the current price of bitcoin (BTC) is $30,000.
The order book shows large buy limit orders at $29,500 and sell limit orders at $30,500.
This creates support and resistance zones: the $29,500 level acts as support, since many buy orders are concentrated there and they will slow down a price drop. Likewise, the $30,500 level is resistance, since a large number of sell orders at that level can cap the rise.
If the price of bitcoin starts to fall, it will most likely meet support at $29,500 and slow its decline or even reverse.
But if there is enough selling to break through this level, the price can drop lower, since the support "barrier" will have been breached.

One of the common order book manipulation techniques is spoofing.
In this case, a trader places large limit buy or sell orders to create the appearance of high demand or supply.
The goal is to push other traders into buying or selling. Before the order is executed, the spoofer cancels their orders, which often leads to a shift in order book sentiment.

 

Example: Imagine that the price of bitcoin is at $30,000, and someone has placed large limit sell orders at $30,100 and $30,200.
These orders can create a sense of strong pressure from sellers and make other traders sell at lower prices, fearing a further drop. However, if these large orders are pulled when the price starts to fall, it signals that the sellers were not real and were probably just creating an illusion to manipulate the market.

 

Let's check how well you've learned the material from this lesson. Answer the questions to test your knowledge and move on to the next lesson.

Congratulations! You have successfully figured out the order book. Now you can analyze supply and demand, identify support and resistance levels, and spot market manipulation. On to new knowledge!