Why did the kingdom of Ghana impose different types and amounts of taxes on different goods?

The Ghanaian king also imposed an import-export tax on traders and a production ... There the gold was exchanged for commodities, the most important of which was salt, that had ... Different historical periods have generated different types of empires.

This is what I got

a, he promoted disarmament

herodotus taught this. herodotus was an ancient greek historian who was born in halicarnassus in the persian empire. he is known for having written the book the histories, a detailed record of his "inquiry" on the origins of the greco-persian wars.