The Role of Specialisation and Diversity Externalities in the Agglomeration of Innovative Activities

31 Pages Posted: 27 Nov 1999

See all articles by Raffaele Paci

Raffaele Paci

University of Cagliari - Centre for North South Economic Research (CRENOS)

Stefano Usai

Universita di Cagliari

Date Written: November 1999

Abstract

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).

JEL Classification: O31, O18, R12

Suggested Citation

Paci, Raffaele and Usai, Stefano, The Role of Specialisation and Diversity Externalities in the Agglomeration of Innovative Activities (November 1999). Available at SSRN: https://ssrn.com/abstract=192948 or http://dx.doi.org/10.2139/ssrn.192948

Raffaele Paci

University of Cagliari - Centre for North South Economic Research (CRENOS) ( email )

Viale S. Ignazio, 78
Cagliari I-09123
Italy
+70-6753764 (Phone)
+70-6753760 (Fax)

Stefano Usai (Contact Author)

Universita di Cagliari ( email )

Cagliari, 09124
Italy

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