Hello. You have not added the painting to which the question is referring, which makes it impossible to answer. However, I can help you by showing you the most efficient way that has allowed contiguity in the sources of wealth in the kingdoms of Ghana and Mali.
Basically, the wealth between these two kingdoms was maintained through a strong and well-structured marketing system. This system allowed for a rapid trade in natural resources that gave the region a strong wealth, through trade in gold, salt and goods, mainly with citizens of Africa and sub-Saharan Africa.
