"Grievances and Public Protests" is an academic book that examines the role of grievances in mobilizing protests in the context of material deprivation. The author, Martín Portos, analyzes the reasons why people protest and to what extent these grievances influence the scale of protest events over time. By considering various levels of analysis, the book argues that the effects of socioeconomic factors, both objective material deprivation and subjective attitudes, are mediated by political stances, particularly political dissatisfaction. Portos develops a framework that sheds light on the dynamics, trajectory, and timing of the conflict cycle that took place in Spain in the wake of the Great Recession. This work makes a valuable contribution not only to the study of social movements but also to a broader understanding of European politics, political sociology, political economy, and economic sociology.