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Different roles. Computational contracts are not about e.g. the "traders" on a security exchange, they're about the exchange institution itself, and the precise definition of how it should work and interact with agents. Behind any sort of "smart market" there's a computational contract of some kind, and the converse may also be true - inasmuch as it interacts with multiple agents who jointly determine the 'prices' involved, a "computational contract" is a smart market, and its usefulness can fairly be assessed as such.