[aylons]

You're not completely wrong, it is just a way too crude of an assessment.

The way power evolves from ancient times, to middle ages, to modern times and finally contemporary times, how the institutions of capitalism are different in form, but not in essence from the institutions of feudalism and other themes are a central topic of Marxist theory.

You seen to agree with him about the root of the exploitation problem, but GP is also right in that there are differences on how the institutions operate and how advanced they are in comparison to those of the past. These new institutions and techniques and dynamics require different tools for analysis.