Daron Acemoğlu, Asuman Ozdaglar, James Siderius, 30 June 2021

Misinformation spreads rapidly on social media platforms. This column uses a model of online content-sharing to show that a social media platform that wishes to maximise content engagement will propagate extreme articles amongst its most extremist users. ‘Filter bubbles’ prevent the content from spreading beyond its extremist demographic, creating ‘echo chambers’ in which misinformation circulates. The threat of censorship and a corresponding loss in engagement could pressure platforms to fact-check themselves, while regulating their algorithms could mitigate the consequences of filter bubbles. 

Gianmarco Daniele, Amedeo Piolatto, Willem Sas, 07 May 2020

Polarisation, populism, and extremism are on the rise on both sides of the Atlantic. This column focuses on the role of policies in multi-level federations (such as the EU) in partially explaining the rise of extreme political parties. An analysis of differences in vote shares between European and national parliamentary elections suggests that support for extreme politicians is highest in countries with the largest gains and losses from federal policies. Eurosceptic parties, which are very protective of national interests, win higher shares of the EU vote in core and periphery countries, whilst the opposite is true for countries in the middle.

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