As a market maker, XTB offers specific liquidity for each instrument, with the available conditions depending on the current market conditions. This means that the market depth visible in the order book in Market Watch is shared with all other clients. To better illustrate how this works in practice, we will use the example used to calculate VWAP prices:
In case of a 10 lot DE30 buy order execution, three price levels would be used. The last price level at which the order will be executed is the level of 12860.7. In such case, the price of 12860.7 and remaining volume of 3 lots (as the order was executed for 10 lots - 3 on the first line, 4 on the second line and 3 on the third line) will become the best available ASK price (i.e. visible at the first level of the order book) for the other XTB clients, and will remain so until the price of DE30 instrument changes (until the Liquidity Provider quotes a new price). XTB refreshes the order book after each new tick, which for the most liquid instruments may happen even several hundred times per second.
In this case, the price of 12861.9, currently at the fifth level of the book, will be at the third level, which will thus be the last level - the fourth and fifth levels will remain empty. In extreme cases, if clients' orders cause all the available liquidity in the book to be used up, no further orders (or closing of existing orders) will be possible until a new tick occurs.
The example below illustrates an empty order book (no liquidity) on the BID side, i.e. no possibility to open Sell positions and close Buy positions:
