To such countries, political and economical returns such as sakuho (emperor's approval) and choko (In exchange of tributes, premium was conferred and the countries were allowed to trade with China).
これらには「冊封」（国王承認）や「朝貢」（貢ぎ物と引替えに賞賜が与えられ、さらに交易することができる）という政治的・経済的見返りを与えた。