In models describing economic situations and phenomena in terms of decision-makers' behaviour, it is important to the solution of the model and results obtained from it to discover what decision-makers know about the situation, each other, each other's knowledge, knowledge of each others' knowledge, etc. The simplifying assumptions of the conceptual apparatus applied to describe this knowledge and information have been outstripped by the applications. This study therefore puts forward a proposal for generalizing this system of concepts.
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