What is the source of income in Song Dynasty?

Funts, the income is from its agriculture, handicraft industry and commerce. Farmers expanded their planting areas and start to plant tea, cotton and other cash crops. Ceramic and minning industries also develop greatly. There were many famous kiln that produced high-quality porcelain wares, such as Jing De Zhen, Ru Kiln in Ruzhou and Ding Kiln in Quyang. Because commerce was developed, the government set up agencies to collect tax.