Interventionism consists in government actions that distort market processes, such as price controls, production regulations, and monopoly privileges. Austrian economists contend that interventionism impoverishes society by causing adverse unintended consequences that necessitate further interventions, which, in turn, lead to additional negative effects. The chapter then reviews different types of taxes and their impacts. Finally, it highlights Mises’ critique of collectivism, emphasizing the impossibility of economic calculation without market prices and private property, and Hayek’s critique, which focuses rather on the overwhelming complexity and knowledge dispersion that a collectivist state cannot effectively manage. Ultimately, Austrian economists attribute inflation, crises, mass unemployment, and monopolistic restrictions to state intervention rather than market processes.