‘At a certain stage of development, the material productive forces of society come into conflict with the existing relations of production, or this may express the same thing in legal terms - with the property relations within the framework of which they have operated hitherto. From forms of development of the productive forces these relations turn into their fetter. Then begins an era of social revolution. The changes in the economic foundation leads sooner or later to the transformation of the whole immense superstructure.’
Marx