Though it has various senses in general usage, subsumption is a term of art within Marx’s critical political economy. It is sub-divided into formal subsumption and real subsumption . These designate changes to the production process during the transition to, and ongoing development of capitalism. These changes in aggregate may be understood as the metamorphosis of human making into capitalist labor, in the sense of work conditioned and ceaselessly transformed by the compulsion to extract surplus value, capital’s ‘invisible essence’. As such they also produce and transform the capitalist class relation.