The aim of this article is to analyse the influence that regional public intervention had in the economic growth and development of Navarre between the end of the XIXth century and 1970. By means of a «sui generis» fiscal federalism, Navarre's Treasury's provision of «merit goods» and infrastructure were above the average level of Spain. However, it was not until the 60s that these incentives, and a lower tax pressure, contributed to the industrialisation of the region. The Programme of Industrial Promotion of 1964 favoured business investments, which accelerated the transformation of this regional economy. Nevertheless, public intervention was preceded by the forces of the market, which inserted Navarre among one of the principal axis of the economic development of Spain at the end of the XXth century.