This book, also published in English by the renowned Routledge in London, under the title 'Individualism in Modern Thought', and with a German edition announced, brilliantly presents the 'reasons for methodological individualism' in the purest 'Austrian' tradition. It combats a common mistake in social the reification of collective concepts, instead focusing on human action and its unpredictable consequences; unintended results of intended human actions that form an 'order without plan', which should be analyzed in individualistic terms.