"The System of Economic Contradictions; or, The Philosophy of Unhappiness" is the seminal work of the great anarchist Pierre-Joseph Proudhon, in which he examines the economic system and social relations of the nineteenth century. The author analyzes the defects of capitalist society, reveals the contradiction between employers and workers, shows inequality in the distribution of wealth. In his book, Proudhon reveals the essence of the capitalist system, its problems and negative consequences. He makes proposals for increasing social justice, equalizing economic inequalities and building a fairer society. Through his critical view of economic processes and his own ideas about anarchism, Proudhon created an important work that became an important source for further research in the field of economics and political philosophy."