All Or None

This refers to a type of response to an order that is placed in the stocks or shares market.

Essentially it means, as the name implies, that only the whole order should be fulfilled, and if it cannot be fulfilled in its entirety, then it should not be transacted at all.

There is a related idea which is called fill or kill, and here if the order cannot be fulfilled in full it will be cancelled, in addition to not being transacted.

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