What is the theme in The Marriage of Figaro by Pierre Beaumarchais?

Social classes is the main theme. From its earliest readings in France, The Marriage of Figaro raised concerns over Beaumarchais's criticism of the social class system. This system, in place since the Middle Ages, put members of the aristocracy in positions of governmental and military power even if they did not merit it. It also allowed for little upward mobility. Figaro's plotting against his master is a usurpation of aristocratic authority. His actions literally demonstrate several bold assertions: that such authority is designated merely by virtue of birth and not by worth, and that his own desire is paramount to the Count's. He and the Count then compete for Suzanne, and Figaro—the worthier man—wins. Figaro also continuously expresses his disdain for the aristocracy, letting no opportunity pass for criticizing the upper class. Among other things, he points out their lack of intelligence and their lax morality.