Re: "Iron Man 3" Review and Discussion Thread (spoilers)
The wealthy have offshore accounts. I heard that some of these accounts are listed with pseudonyms. Isn't it possible that Stark could have gotten access to one of those funds, and the villains, not knowing his finances, wouldn't be the wiser about his movements?
But that just raises the question, did Stark have the time to get his credit card? I doubt he carries the card for an account he has listed under an alias with him all the time. Although, maybe the Iron Man suit has a compartment where it keeps credit card(s). Probably the most secure place he can keep them, and they're available in emergencies.
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