The founding cause of the 2019–2020 Hong Kong protests was the proposed legislation of the 2019 Hong Kong extradition bill. However, other causes have been pointed out, such as demands for democratic reform, the Causeway Bay Books disappearances, or the fear of losing a "high degree of autonomy" in general. The Hong Kong protests are unique in this respect from democracy protests in general, which are often provoked by economic grievances. Subsequent actions by the police, such as mass arrests and police violence, as well as what was perceived to be an illegitimate legislative process of the bill, sparked additional protests throughout the city.