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Fungibility as a book category explores stories in which people, objects, identities, memories, emotions or roles are treated as interchangeable commodities—examining what it means to be replaceable in markets, institutions and intimate relationships. Spanning speculative and contemporary fiction, psychological drama and satirical dystopia, the genre interrogates commodification, surveillance, labor, digital avatars, cloning, traded experiences and the moral and emotional fallout when value is measured by exchangeability. Narratives often focus on characters confronting erasure or duplication, systems that assign price to the unpriceable, and the tensions between individuality and systemic interchangeability, using speculative premises or realist detail to ask philosophical and political questions about worth, agency and belonging. Readers who like socially conscious, idea-driven fiction—think socioeconomic critique mixed with human-scale stories and speculative twists—will find "Fungibility" a genre that spotlights the human costs and strange freedoms of a world where everything can be swapped.

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