With a new lands annexed and close relations with powerful neighbors, his reign saw the golden age of the Sukhothai economy. The vast fertile lands of the kingdom offered bountiful harvests of all types of agricultural products, especially rice. Because of its numerous rivers, fish and other seafood were also abundant. With large amounts of agricultural products, trade became increasingly strong and profitable. Besides agricultural products, the Thai kingdom also exported manufacturing goods. When King Ramakhamhaeng brought the ceramic making technology from China, the Kingdom began to produce a glazed ceramic known as sangkhalok or sawankhalok, named after the town of Sawankhalok where it was made. This ceramics served as an export product to neighboring countries, including Indonesia and the Philippines. Another reason for the good condition of the economy and trade was the policy of free trade. The government of the king didn't imposed any taxes on income or imports, thus it became an incentive to become a merchant and for the people to become productive