I found this here at Today in Social Sciences. It simplifies some things, of course. You have at first the “feudal lords” who fight with the “serfs and peasants.” That conflict gives you a winner: “city life.”
Then those who enjoy “city life” clash with the “guilds.” That results in a new group of victors: “entrepreneurs” who in turn then end up fighting with the “proletariat” and then we finally get the final outcome: “communism.”
That’s a whole lot of simplification of Marx even accounting for the fact that the image was made for an undergraduate course called “Cultural and Institutional History of Modern Europe.” I’m not criticizing a professor’s choices, but merely pointing out that there are multiple ways to communicate the essence of Marx’s ideas about history to a somewhat apathetic young student population. And that it’s easy to fudge things.
To wit: what is interesting here is the way two of the categories are chronologically positioned: the “City life” people come first, and then the “Entrepreneurs.” Yet, as should be obvious, there’s (a) a lot of overlap between the two and (b) there’s nary a mention of the bourgeoisie here. As my esteemed colleague has been ably chronicling here and here, it is almost impossible to separate the notion of “City life” from definitions of the “bourgeoisie.” In fact, conceiving one is impossible without the other.
My point here? Teaching Marx (even to apathetic teenagers) demands some care in definitions.