Thinkers as diverse as Immanuel Wallerstein, with his world-systems theory, David Harvey with his analysis of the Limits to Capital (1982) and time–space compression, and Harvey's erstwhile student Neil Smith with his Uneven Development, can all be seen to develop one or other aspect of this line of Marxist thought. The early work of Anthony Giddens and in particular his concept of "time-space distanciation", e.g. in his Critique of Historical Materialism (1981), has also been influential in this area.