Slums swelled at the same time as new settlements appeared. Since 1998, the sector has been revitalised through the introduction of a tax linked to sales of cement, which will provide financial resources to the Fonds Social de l'Habitat (FSH), which provides a levy of 15 centimes/kg (Fawzi Zniber, 2015). It involved 324 000 households (1.6 million inhabitants) in more than a thousand districts in 85 cities, of which nearly a third concentrated in the Casablanca agglomeration alone (AFD, 2011).