In Sub - Saharan trade, gold , salt and slaves were the most important commodities.
Gold came from Bambuk in the valley of the Senegal where there was a lot of alluvial gold. Rock salt came from areas in the Sahara which were once covered by inland seas. Its extraction, in large blocks under the blazing sun, was appalling work carried out by slaves.
Slaves mainly came from around the region of Lake Chad, where the Zaghawa tribes made a habit of raiding their neighbors and selling them to Arab purchasers in the north.
Other important commodities were cola nuts, dates, copper and brass.
It is called progressive revelation.
What is progressive revelation?
The things that we all know that God revealed were not all given at once thus, His revelation was given in stages or in other words, God revealed various aspects of His will and overall plan for mankind over a different period of time (dispensation) . This is called progressive revelation.
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Not exactly because you dont have to be exactly skillled to earn a living many people that have no little to no skills still a decent amount to be a living.
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