At Best
An instruction to buy or sell straight away at the best price currently available.
In plain English
An instruction to buy or sell straight away at the best price currently available.
Telling a dealer to trade at best means: do it now, at whatever the best available price is. It is the old-school spoken version of a market order.
You get speed and certainty of being filled, and you give up control of the exact price. In a calm market that is fine; in a fast one the 'best' price can be a nasty surprise.
Keep this word for good
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