Germano et al. (2026) provide a theoretical model of supply-side effects but their empirical validation uses difference-in-differences on ideological extremism, not on the affective polarization outcome the framing requires.

<iframe
  src="https://www.isonomia.app/embed/claim/1aa57596f38ec656156c17756ad89793439cfc6220310da89da304eca52a0f22"
  width="600"
  height="280"
  frameborder="0"
  style="border: 1px solid #e5e7eb; border-radius: 8px;"
  title="Isonomia Claim"
  loading="lazy"
></iframe>

Copy and paste into any website or forum that supports HTML.