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Ach, sorry for not getting to this in YKTTW, but this name really does not work. The expression Business As Usual does not bring to mind anything about inheritances. This ought to be renamed to something more clear, like Wacky Business Inheritance Plot.
I wouldn't say that "inheritance" is a necessary element of the trope; it could be someone who has to sit in the boss' chair for a week while he's on vacation.
Also, "Wacky Business Inheritance Plot" lacks the catchiness of "Business as Unusual."
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How well does it match the trope?