  Residential segregation is analyzed via the Schelling model, in which two
types of agents attempt to optimize their situation according to certain
preferences and tolerance levels. Several variants of this work are focused on
urban or social aspects. Whereas these models consider fixed values for wealth
or tolerance, here we consider how sudden changes in the tolerance level affect
the urban structure in the closed city model. In this framework, when tolerance
decreases continuously, the change rate is a key parameter for the final state
reached by the system. On the other hand, sudden drops in tolerance tend to
group agents into clusters whose boundary can be characterized using tools from
kinetic roughening. This frontier can be categorized into the Edward-Wilkinson
(EW) universality class. Likewise, the understanding of these processes and how
society adapts to tolerance variations are of the utmost importance in a world
where migratory movements and pro-segregational attitudes are commonplace.
