This paper addresses both theoretically and empirically how to deal with ambiguous decisions. We briefly discuss the most relevant decision making criteria under ambiguity proposed in the literature, as specific cases of a general functional based on NEO-capacities. Then we study the impacts on Venetian port activities of MOSE, the dam system aimed to protect the Venice Lagoon from the periodic flooding. We show that the estimated impacts depend crucially on the levels of optimism and pessimism of the decision maker and in particular they substantially di¤er from the ones calculated on the basis of the expected value framework.
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Paper provided by Dipartimento di Scienze Economiche "Marco Fanno" in its series "Marco Fanno" Working Papers with number
0080.
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