The person who is responsible for the "all-compassing" financial and business necessities on a film production
In filmmaking, the Executive Producer is primarily the person who is responsible for the "all-compassing" financial and business necessities being met so that a film may be produced.
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In short, the Executive Producer is the "money guy" and all that that may incorporate. They are present to make sure the money invested in the film used in the most prudent fashion. He or she may serve as a direct investor or as an agent of one, such as a studio.