Mr. Laser Beam wrote:
The problem with Jack's backstory in the novels is that he's kind of a business geek (in Red October the novel, he spends quite a lot of time just sitting around crunching numbers). I'm not surprised they had to jazz it up a bit for this film.
This film actually takes the opposite tack. His economic, number crunching, and pattern recognition acumen are precisely the reason why the CIA recruits him and tells him to go work on Wall Street to uncover banking transactions and stock transfers that point toward potential terrorist attacks and attempts at economic destabilization. His business geek cred is the primary catalyst for the events of the story, which of course lead to the usual action scenes and so forth.