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The wiki article on Mayan Trade has a good overview of Mayan social structure. In essence:
The Maya relied on a strong middle class of skilled and semi-skilled workers and artisans which produced both commodities and specialized goods.
They also had a large base of slaves and serfs - agricultural specialists. Members of the nobility had specialized hereditary roles: military leaders, farm administrators, tax collectors, etc.
There is some difference of opinion on the military - warfare was either carried out by and for the elite; or it was the duty of all social strata and distinguished military service resulted in social promotion.