It is now well known that service industries, and especially the tourism sector, significantly contribute to economic and social development in the European Union. Intrinsic to the growth of the tourism industry has been the public interventions that, directly or indirectly, have facilitated the development of this sector. In this context, this paper aims to contribute to the knowledge on the design and implementation process of support policies for tourism businesses in Spain, using institutional economics as the theoretical framework. Based on a comparative case study, the article shows that despite the relevance of the legal system, the most important factors for the promotion of the tourism business are the socio-cultural ones.