This book gathers Patrick Murray's essays reinterpreting Marx and Marxian theory published since his 'Marx's Theory of Scientific Knowledge' (1988), along with a previously unpublished essay and an introduction. Murray's essays concentrate on Marx the historical materialist, the investigator of historically specific social forms of wealth and labour. There is no production in general; the production of wealth always involves specific social forms and purposes that matter in many ways. Marx's attention to the dynamics and far-reaching consequences of historically specific social forms sets him off from classical political economy and traditional Marxism. In probing Marx's dialectical accounts of the commodity, value, money, surplus value, wage labour and capital, this book establishes Marx's singular relevance for critical social theory today.