Compared with the economic development of the Tang Dynasty, what new changes have occurred in the social economy of the Song Dynasty?

Compared with the Tang Dynasty, the Song Dynasty had many new changes in its economy, including the following: 1. Prosperity of commerce: In the Song Dynasty, commerce developed and the market flourished. Commercial activities frequently appeared in many new commercial fields such as silk, porcelain, tea, etc. 2. Handicraft development: Handicraft in the Song Dynasty was greatly developed, such as painting, calligraphy, porcelain, textile and many other fields. Many new handmade products were constantly emerging. 3. Agricultural transformation: The agricultural production in the Song Dynasty developed towards refinement, specialization, and mechanized development. Many new agricultural technologies such as irrigation, water conservancy, and fertilizers appeared. 4. Trade expansion: The Song Dynasty expanded its trade with foreign countries, and the prosperity of foreign trade exceeded that of the Tang Dynasty. 5. Changes in the monetary system: The monetary system of the Song Dynasty had undergone great changes. The currency increased, the currency depreciated, and the currency became more and more expensive. At the same time, there was also the emergence of seignorage. The changes of the Song Dynasty reflected the development and transformation of the ancient society in politics, economy, culture and other aspects, which had a profound impact on later generations.