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From the case study of Milan urban region, the article focuses on the forms and capacity of business actors to participate to territorial public action in the long run. Relying on the corporatist approach, it shows that the relations between business organizations and local public actors vary over time in reaction to both institutional and economic changes. Despite this, the most organized business actors have been able to renew their influence over time. The analysis complements researches on the territorialisation of economic interest groups in Europe, by factoring in structural variables and power dynamics.