The Anti-Extradition Bill Movement in 2019 sparked the most radical mass protests seen in Hong Kong since the transfer of sovereignty. Scholars have proposed various explanations for the radicalization of the protests, as well as for the mass support for this radicalization across various sectors of society. However, economic grievances have been relatively downplayed in attempts to understand the radical protests. Using data from a survey conducted during the suspension of the movement in 2020 (N = 1,574), this study examines the relationship between economic grievances and support for the protests. Through mediation analysis, the findings show that individuals who perceived themselves as belonging to a lower class tended to have a diminished sense of social mobility and equality. These negative perceptions contributed to concerns about the activities of Mainland Chinese individuals and the use of public resources. Thus, these particular economic grievances were found to be positively associated with support for the 2019 movement.