Isaiah Berlin made a now classic distinction between negative and positive conceptions of freedom. This book, first published in 2005, introduces a fresh way of looking at these conceptions and presents a new defence of the positive conception of freedom. Revealing how the internal debate between various versions of negative freedom give rise to hybrid conceptions of freedom which in turn are superseded by various versions of the positive conception of freedom, Silier concludes that Marx's concrete historical account of positive freedom resolves many of the key debates in this area and provides a fruitful framework to evaluate the freedoms and unfreedoms that are specific to capitalism.