A schism about the division of revenues in the world’s oldest customs union threatens to derail the process of regional economic integration in Southern Africa. The internal problems plaguing the Southern African Customs Union (SACU) for the past year have entered a new phase. A concept study looking into revenue sharing from the SACU pool proposes a radical overhaul in which South Africa receives more money, while Botswana, Lesotho, Namibia and Swaziland (BLNS) see their shares drop.