This paper will propose a comparative analysis of the conceptualization of colonisation that could shed light on the contemporary economic analysis of the colonial legacy in Africa. More specifically, this article will propose a return to old debates on colonisation, with a special focus on French 19th century political economy. Three main institutionalist lessons can be drawn from a careful analysis of French colonial economics of the 19th century. First, by institutions, the authors referred not only to the modes of colonisation – liberalism or collectivism? – but also to the actors: What should be the respective role of states and of private actors (entrepreneurs, banks, settlers) in the colonisation of Africa? Second, the colonial debates involved a discussion of property, whether in the sense of land ownership (individual vs. collective) or under the prism of property rights. Third, the analysis of the colonisation of Africa by French economists reveals an understanding of institutions as cultural values, norms or even racial attributes.