The social sciences have produced both theoretically and empirically a large literature in order to explain why urban areas are socially differentiated, and also the consequences of this urban specialization on several economic and social variables. But the major part of all these works is...

<italic>The social sciences have produced both theoretically and empirically a large literature in order to explain why urban areas are socially differentiated, and also the consequences of this urban specialization on several economic and social variables. But the major part of all these works is...</italic>