Dear my students and all future students and also the general public: if you aren't sure if you should use 'social' or 'societal' in a sentence you should use 'social.' Use 'social.' Are there times when one should use societal? Probably. Is this one of them? No.
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... Darn. I thought it was a pretentious way of saying "Marxist." Good to know!
To be far, the number of cases where you'd use Marxian rather than Marxist are, I think 1) extremely few and 2) very technical in places where, say, Marxist economics is not quite the same for fidgety technical reasons as Marxian economic analysis.
