Input (grade 13): Trade routes extended across Tanzania into modern day Democratic Republic of the Congo, along which goods were brought to the coasts and were sold to Arab, Indian, and Portuguese traders and even reached as far as China and India.
Output (grade 7): Trade routes extended across Tanzania into modern day Zaire. Along these goods were brought to the coasts and were sold to Arab, Indian, and Portuguese traders and even reached as far as China and India.