Shaping collective action in financial markets through popular expertise

In 2021, a social movement rallying retail investors unexpectedly shocked Wall Street, forcing a prominent multi-billion-dollar hedge fund to shut down one year later, after incurring massive financial losses. Social movements in financial markets have significantly developed in the wake of the 2007–09 financial crisis, resulting in the emergence of various collective actions. We analyze one recent example of such action undertaken by the r/WallStreetBets (WSB) community on Reddit, which disrupted the stock prices of several "meme stocks" (e.g., GameStop) by disseminating influential investment narratives. We analyze the 150 most upvoted Due Diligence posts on WSB and interview eight members of its community. We find that a popular expertise in investment narratives emerged, developed, and was propagated on this digital platform. WSB authors' claim to popular expertise is made in a hybrid language combining traditional financial expertise with an accessible and entertaining writing style, complemented by references to pop culture. Our analysis brings out a growing resentment among retail investors about the unfairness of financial markets, and its role in mobilizing them for collective action that challenged the existing order of things. Yet this widespread resentment did not spontaneously translate into a meaningful, sustainable collective action initiative. Our thesis is that the development of popular expertise played an instrumental role in the formation of WSB's collective action initiative targeting several perceived investment opportunities.