Salt
Copper
Glass
Ceramics
I don’t need to know I am just curious 
Chosen Answer:
SLAVES…………… (all the other products you mentioned were useful)
The Northern Region was a major arena of slave raiders and a key supply source for slaves who were sent to markets and sold to local merchants from the South. They were subsequently marched on the coast and resold to European traders for export…
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EDIT to other answer:
SALT WAS NOT ONLY GOOD BUT A CRITICAL NEED IN THE SOUTH.
Ghana became very rich as a result of the “salt-gold trade” between West and North Africa. This trade was very important, and Ghana came to control not only gold and salt but also the trade routes that went through their land. Why was the salt-gold trade important? People from North Africa desired gold and people from West Africa needed salt. There was a place called Wangara to the south of Ghana that was incredibly hot. The Wangaran people lost so much natural salt through sweating that they had to eat salt in their daily diets to survive. Unfortunately they had no salt in their land. Gold is what the Wangaran people had plenty of, and they were happy to trade it to get the salt they so desperately needed.
Salt was mined to the northeast of Ghana in the Sahara Desert, and Arab traders from the north loaded their camels and donkeys with salt to trade for gold. Traders had to go through Ghana, and so Ghana became like a middleman in the world of the salt-gold trade. Other goods were brought from the north as well, like dried fruit, leather, cotton cloth, and copper.
https://docs.google.com/viewer?a=v&q=cache:adhlF_pT57wJ:chnm.gmu.edu/fairfaxtah/lessons/documents/africaPOSinfo.pdf+&hl=en&gl=us&pid=bl&srcid=ADGEESh8W_qElcsoPr0KUsgOUNnIwBqYP7ISIrjnFD2YOMpG6KglfyivaBWsmO7cY7MmIvL4CFpvLhLM0E180C8_LDZs8KdSJPIj8kj6wtRbSsL041y2ntCQf6b981YBrgD2BX5SvYku&sig=AHIEtbRcx-Lt16z7Tu0qkN4aAlH5M1D23g
“Although Ghana was rich in many things, it did not have salt. As salt is an important spice, which is used for day-to-day life, it was very critical for Ghana to have enough and more quantities of salt. They began to trade with Northern kingdoms, which lacked gold.”
http://ancientafricad.wikispaces.com/Ancient+Ghana+Trade
“While the Sudan, where the Empire of Ghana was situated, posessed a large amount of gold, the region lacked adequate salt for the survival of Empire’s population.”
http://library.thinkquest.org/13406/sh/
by: Ted H
on: 8th April 13
