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Urban Underclass is an Economic Policy Card from The Black Death, a scenario in Civilization VI: Gathering Storm.
Strategy[]
Urban Underclass provides extra 
Gold and 
Faith in each city.
Civilopedia entry[]
The rise of cities meant that along with gatherings of merchants and skilled tradesmen, there rose a class of individuals whose social standing was judged to be inferior or unwanted because they did not fit neatly into social norms of the feudal period. Arguably these attitudes extend into the present age.