If you were to go north from the Sahel, you'd find . If you'd go south from the Sahel, you'd find .

Icant awnser the qustion bc u have the planets not listed

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.