This replaces the earlier Insulae, and has practically the same effect. However, you'll need an additional District in each city in order to use it. This shouldn't be a problem for older cities, as each of them should have at least 3 districts already. The logic of using Medina Quarter is the same - it is a great way to speed up File:Citizen6.png Population growth in big cities which have already exhausted other File:Housing6.png Housing options, but have no access to Neighborhoods. However, you should juggle it with other 'permanent use' Economic Policies, such as Triangular Trade. .