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Don Fernando, the main character of El príncipe constante, has received most of the attention of the specialists in the works of Calderón, but many critics had also analyzed the extraordinary transformation of the King of Fez, but with significant differences of points of views and conclusions. The Muslim monarch treats the captive prince with exquisite courtesy as long as he thinks that the prince can be exchanged for the city of Ceuta. But at the end he behaves like a tyrant as soon as he realized that don Fernando refuses the exchange. This article uses the Prospect Theory of Daniel Kahneman and Amos Tversky to analyze the transformation of the Muslim monarch with the purpose of finding a critical approach that could explain a rather paradoxical or at least incoherent behavior.

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Originally published in Atalanta: Revista de las Letras Barrocas.





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