Eolian landforms and processes are those associated with the work of the wind.

The saharan africa is desert not forest

Ibelieve it was because of the gas act in order to preserve fuel 

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.