One of the recurring complaints of consumers living in France's overseas regions is how high the cost of living is compared with Metropolitan France. At the heart of this criticism is the 'octroi de mer' or dock dues, a tax paid on the import of goods to these territories. This tax has been in place since 1670 and the start of the French colonial system. And the European Union has just agreed to continue it to at least 2027. Julien Sartre reports on the history and impact of a tax that is a throwback to colonial days and which still leaves a burden on often poor French consumers living in overseas départements.