In an automated black box trading application that should be identified as the primary person in use cases? Is this the system itself or the system administrator or organization that is interested in the system?
The actor is external to the system and interacts with it; the organization is not an actor as such, it is an interested party.
In this case, the main actor will be the stock market, which sends quotes to the automated trading system.
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Your actor will be any system using your black box trading application.
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