The displayed current price might be ₩1,000 while a market order executes at ₩1,003. The current price is usually the most recent trade; the price available to you now depends on orders remaining in the book.
Common order-book terms
- Bid: A price offered by a buyer.
- Ask: A price requested by a seller.
- Best prices: The highest bid and the lowest ask.
- Spread: The difference between the best ask and best bid.
- Depth at a price: The quantity of orders waiting at that price.
Waiting orders are not guaranteed future trading volume. They can change quickly if cancelled or filled before your order.
Market or limit: what do you prioritize?
A market order aims to trade promptly against available orders. It does not guarantee a chosen price and may fill across several price levels if it is large. Exchange price-protection mechanisms may leave part unfilled or reject the order.
A limit order permits trading only at your chosen price or a better one. It controls price but does not guarantee execution. A limit order that already matches available prices can fill immediately instead of waiting.
Why quantity matters too
Suppose one unit is offered at ₩1,000 and nine units at ₩1,010. Buying ten units gives an average execution price of ₩1,009, assuming orders remain unchanged and there are no fees. Calculating total cost from only the first price in the book misses this difference.
A large buy wall does not guarantee that a price will hold. One exchange's order book is not the whole market, and some orders may not be displayed. Before submitting, check the estimated execution amount, fees and whether cancellation is possible. The order-book figures here are hypothetical examples explaining how orders work.
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