Abstract: In this paper we test the relationship between territorial economic performances and related variety in the industrial sector within French employment zones over the period 2016-2021 using a spatial econometrics model. To do so, we mobilize Theil’s notion of enterprise as translated by Frenken (2007) in the construction of related and unrelated varieties. we first test the stability over time of this relationship, while controlling for the effect of urbanization externalities, specialization and market concentration. Secondly, we investigate whether there is any non-linearity in this relationship, by grouping employment zones according to their level of relatedness, to test for possible coefficient divergence. This paper highlights France’s current industrial production structure and its impact on the economic performance of its employment zones, which is crucial to the implementation of appropriate industrial policies, particularly in the context of the drive to reindustrialize the French territory.