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OECD Culture and Local Development.pdf - PACA

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ANNEX 2<br />

The second measure is given by Gb i :<br />

Gb 2<br />

i<br />

k<br />

= [ i<br />

( Z<br />

k<br />

− Z<br />

k<br />

m Z<br />

)<br />

2<br />

∑<br />

k<br />

i<br />

i sk<br />

Z<br />

k<br />

= <br />

i i<br />

x<br />

i<br />

with <strong>and</strong> is the ranking of the geographic unit when units are ranked<br />

i<br />

Z k<br />

by increasing order of . This index falls between 0 <strong>and</strong> 1. If it is 1, concentration is<br />

maximised, <strong>and</strong> if it is 0, dispersion is maximised.<br />

These indicators can be used to identify territories, while at the national level<br />

they identify different degrees of concentration for sectors of activity. Thus, in the case<br />

of France, if we distinguish the arts, culture (the arts plus cultural industries) <strong>and</strong> creativity<br />

(culture plus certain so-called creative industries) by increasing order of extension,<br />

we find growing indices of concentration. This reinforces the hypothesis of cultural<br />

<strong>and</strong> creative arts districts as opposed to the notion that these activities are scattered<br />

throughout the territory. (Paris has been left out of the sample to avoid biasing it through<br />

that city’s very high concentration of artistic, cultural <strong>and</strong> creative activities, <strong>and</strong> to<br />

provide a more useful overview of the hypotheses tested).<br />

Table 1. Concentration indices for three types of activity<br />

(France excluding the City of Paris)<br />

HERFINDHAL GINI 1 GINI 2<br />

Art 0.12 0.11 0.03<br />

<strong>Culture</strong> 0.19 0.13 0.25<br />

Creativity 0.29 0.18 0.44<br />

Source: Greffe X. & Simmonet, V. (April 2004), Analyse de l'identification des concentrations culturelles, Paris: DATAR, p.23-6<br />

Annex 2.2. Synergy<br />

Specialisation <strong>and</strong> concentration may not be enough to define a district or cluster,<br />

because the determining factor will be the quality of interdependencies among the<br />

industries in the territory concerned. Yet, as with concentration, synergy only deserves<br />

attention if it appears more prominently than does synergy among the same activities<br />

at the national level. For example, while it is logical to expect a certain flow of trade<br />

between book publishing <strong>and</strong> image publishing at the national level, a district for<br />

these businesses will not appear unless the flow is greater than the national figure.<br />

The first step is to define the correlations between activities that appear logically at<br />

the national level. The second step is to identify the quality of synergy within a given<br />

territory, in order to determine whether it is of greater quality than synergy at the national<br />

level.<br />

CULTURE AND LOCAL DEVELOPMENT - ISBN 92-64-00990-6 - © <strong>OECD</strong> 2005 185

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