in the game, you must build different structures (communes, markets, farms etc.) to provide the citizens with food, goods and jobs (or else pay them unemployment benefits). you can't control how much taxes they pay -- instead, you manage the resources they produce in order to maintain a proper balance.
it still assumes a roughly-capitalist idea of how the economy works, but within it, you can go anywhere from "libertarian laissez-faire republic" to "massively state-owned social democracy", with different consequences for each.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko