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The benefits of agglomerating in cities are often divided into those of matching, sharing and learning, following Duranton and Puga (2004):

1 http://www. thekuzaproject. org/2 Cities as complex systems are explained on the next section. 3 A nexus can be defined as connections linking two or more things or as a central point, and the urban land nexus encompasses both: it is where people, their constructs and activities are connected together to form urban centres.