In response to questions about Marx's relevance today, this program explains how Marx's criticism of capitalism was unique (more micro-focused than macro-focused analysis). It shows how Marx's critique of capitalism differs from his critique of slave and feudal class systems, on the one hand, and from post-capitalist ("socialist" or "communist") class systems, on the other. Marx's analysis is shown NOT to prioritize the private vs public enterprises dichotomy that has been debated as "the issue" over the last century. Instead, Marx's relevance for today lies in arguing for a post-capitalist system that is different from the slave, feudal, and capitalist class systems it seeks to replace.