Abstract
The paper aims to question the required decision theory concept, structure, and mechanism under the current challenges of optimality model of rationality crepuscule, sustainability model of rationality emergence, and evolutionism extending from the biological species to the symbolic ones (as decision theory is). To this end, the three symbolic species are logically described based on their sufficiency predicates, then the three sets of sufficiency predicates are put together in order to find the compatibility among them, as either binomial or trinomial compatibility. So, three complete compatibilities are found based on which some concluding remarks are provided.
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