The renewal of interest in the study of imperialism has changed the debate on globalisation, previously centred exclusively on the critique of neo-liberalism and on the new features of globalisation. A concept developed by the main Marxist theorists of the 20th century - which enjoyed a wide diffusion in the 1970s - has again attracted the attention of analysts because of the aggravation of the social crisis of the Third World, the multiplication of armed conflicts and the deadly competition among countries.