2. The Yuan Dynasty changed the traditional policy of "emphasizing agriculture and restraining commerce" in the previous dynasty, advocated the development of commerce, and promoted the recovery of social economy.
3. The results of foreign exchange.
Tang dynasty:
The collection of tea tax, the popularization of rice cultivation in agriculture, the invention and application of new agricultural instruments, the progress of silk technology, the prosperity of foreign trade, and the division of middle east and west cities.
Ming dynasty:
1, the commodity economy is budding and developing, no matter it is limited to the developed areas in the south.
2. The economic aggregate has greatly increased.
3. Silver poured into China.