In recent years, the post-truth phenomenon has dominated public and political discourse. This article offers a functional analysis of its mechanisms based on the category of narrative. After providing a brief definition of post-truth as a conceptual foundation, I trace the meaning of the term ‘narrative’ in the works of Jean-François Lyotard, focusing on the elusive category of small narrative. Utilizing terms and concepts of contemporary narrative theory, I propose a general definition of cultural narrative and reconceptualize Lyotard’s petit récit (...) as a particular case of this superordinate category. Drawing on Lyotard’s phrase linguistics as set out in The Differend, I develop the category of epistemic sphere to analyze Donald Trump’s MAGA movement as an example of post-truth politics, the rise of populism and the epistemic fragmentation of society. (shrink)