A promissory note is a one-way undertaking. The maker promises to pay to the payee. There is nothing promised by the payee. The whole point of having a promissory note is to have a document that clearly states an obligation to pay. By contrast, most contracts are bilateral, meaning that each party promises to do something. And those promises are usually mutually dependent: if one party breaches, then the other may be excused from further performance. But that is not the case with a promissory note.

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