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The role of specialisation and diversity externalities in the agglomeration of innovative activities

Paci, Raffaele - Usai, Stefano (1999) The role of specialisation and diversity externalities in the agglomeration of innovative activities. Working Paper. CRENoS.


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This paper contributes to the analysis of the process of spatial agglomeration of innovative activities by investigating directly its determinants. Our main purpose is to identify the extent to which the degree of industrial specialisation (Marshall externalities) or diversity (Jacobs externalities) in the region may affect the innovative output in a particular local industry. Moreover, we test if any relevant difference arises with respect to the role of diversity in metropolitan areas and in high-tech sectors. The analysis is carried out thanks to an original databank on innovation and production across Italian local labour systems. According to the estimation results there are clear signs of the two types of externalities working simultaneously: Marshall externalities (or localisation economies), associated to industrial specialisation within the sector and also within the science base cluster; and Jacobs externalities (or urbanisation economies), associated to the degree of diversity of both the local districts and the science base cluster. With respect to the industrial diversity at the local district level, however, it is worth noting that it plays a different role depending on the dimension of the local district (whether it is a metropolitan area or not) and on the type of industry (high Vs low tech sectors).

Item Type:Technical Report / Working Paper / Project Report (Working Paper)
Institution:Universita' degli Studi di Cagliari
Divisions:Centri > CRENoS Centro Ricerche Economiche Nord Sud
Subjects:Area 13 - Scienze economiche e statistiche > SECS-P/02 Politica economica
Uncontrolled Keywords:Innovation, Industrial agglomeration, Externalities, Geography, Italy
ID Code:339
Deposited On:14 Nov 2008 08:35

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