This book is a comprehensive survey of methodological individualism in social, political and economic thought from the Enlightenment to the 20th century. Exploring the works of such figures as de Mandeville, Smith, Marx, Spencer, Durkheim, Simmel, Weber, Hayek, Popper and Parsons, this study underlines the contrasts between methodological collectivism and methodological individualism. The detailed analysis offered here also reveals the theoretical presuppositions behind the collectivist and individualist traditions and the practical consequences of their applications. Infantino concludes in favour of individualism.