At a random time on a random road in Mombasa a man pushes his mkokoteni (wheel cart) and shouts 'Maaaali Maaaali, Maaaali Maaaali'. On hearing this some ladies living in the vicinity come out of their houses with a wad of old clothes. The mali mali exchanges new items (mostly crockery) for old clothes.
A typical scenario would include a lady demanding 6 bowls instead of 5 for the 2 pair of trousers and 5 shirts she gave away. The mali mali would then complain on the condition of the clothes and as they're haggling perhaps a nearby beggar runs away with anything he can grab. This exciting form of barter trade pleases all. The children even come out in hopes of persuading their parent to get a a toy as one of the returns.
Growing up it was a fascinating scheme to witness. I do wonder where they have all disappeared to. It's been forever since I last saw them.