Glossary · M
What is Market order?
An order to buy or sell immediately at the best available price. It crosses the spread and is the aggressor.
In context
The aggressor, also called the initiator, is the order that causes a trade to happen at the moment it arrives. CME's own market-data documentation uses essentially this definition: the aggressor is the order that, when entered into the book, immediately triggers a trade. Usually it is a market order or a marketable limit order.
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