All of the options here have contributed to the dramatic growth of the Chinese economy since the late 1970s except more efficient long-term economic forecasting by the Communist Party leadership.
Aksum's access to both the Red Sea and the Upper Nile enabled its strong navy to profit in trade between various African (Nubia), Arabian (Yemen), and Indian states. They traded with Roman traders as well as with Egyptian and Persian merchants. The empire was also rich with gold and iron deposits.
Vatican City is the world smallest country
