BEST EXECUTION
best execution: translation
The act of achieving the most advantageous price for a transaction of a particular type and size. The duty is always owed to private customers as well as to non-private customers unless they have waived this right. Dresdner Kleinwort Wasserstein financial glossary
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The obligation of Market Makers, broker/dealers, and others to execute customer orders at the best price available at the time the trade is entered. Exchange Handbook Glossary