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After the interview with Big Tech Corp, Andrea tells the interviewer, Alice, that her sister works for Apple Computers, and she would "hook her up big time" if Andrea was hired. Alice immediately hands Andrea an employment contract, which Andrea happily signs. Does Andrea have to now call her sister?
No. This promise, although supported by consideration, would not be enforceable--and therefore not-binding--because Alice would be asking for a court to enforce bribery.