This book sheds light on the role that grievances play in mobilization dynamics in the context of material deprivation. Why do people protest? To what extent do grievances account for the varying size of protest events over time? Covering different levels of analysis, the author argues that the effects of socioeconomic aspects (both objective-material deprivation and subjective-attitudinal grievances) are mediated by political attitudes, especially political dissatisfaction. He develops a framework to account for the dynamics, trajectory, and timing of the cycle of contention that unfolded in Spain in the shadow of the Great Recession, contributing not only to the field of social movement studies but to our broader understanding of European politics, political sociology, political economy, and economic sociology.