Monopoly was developed in the Song Dynasty, and almost all items related to life were monopolized by the government. If private capital wants to participate, it must first buy "bills". Monopoly goods are inherently beneficial to prices, and then circulation tax is levied. In ancient China, farming civilization dominated, and agriculture was always emphasized, while commerce was suppressed. Because of the influence of land and productivity, there can be no extremely developed economy. Song Dynasty had an extremely loose political system, and the foundation of economic development did not depend on agricultural production.

The economic development of the Song Dynasty largely depended on the promotion of the literati class, such as the invention of movable type printing, because of the papermaking and the spread of books in the Song Dynasty. Navigation compass is directly related to the prosperity of shipbuilding industry and foreign trade. However, the Ming Dynasty was actually conservative in economic policy. Zhu Yuanzhang, the founding emperor of the Ming Dynasty, came from the bottom, so he attached great importance to agriculture, suppressed commerce, and also implemented the policy of sea ban. The Ming dynasty was definitely a powerful dynasty, and it was one of the best powers in the world at that time, both militarily and politically. No, the Ming Dynasty was founded, and there were various wars between the North and the South at the end of the Yuan Dynasty, and the whole country was deserted. In addition, the Yuan Dynasty only needed grasslands and was not interested in farming. At this time, Lao Zhu could only choose to emphasize agriculture and restrain commerce, so the sea was banned, the whole people cultivated, and the economy recovered. He has no other way! No dynasty can match the Ming Dynasty.

Although the Yuan Dynasty also tampered with the history of the Song Dynasty, the degree of tampering was limited, mainly because the Mongols in the Yuan Dynasty did not attach much importance to the role of culture and did not strictly engage in literary inquisition and cultural brainwashing in the Qing Dynasty. However, the limitations of most emperors in the Ming Dynasty are still obvious. They are closed-minded and hate the commodity economy, so they support the development of agriculture and emphasize agriculture while restraining commerce. This inertia of ruling ideology is persistent and harmful.

At that time, Zhu Yuanzhang was under the banner of "Sun and Moon Reopen the Great Song Dynasty", that is to say, under the banner of overthrowing the Yuan Dynasty and restoring the enlightened rule of the Song Dynasty. However, in the historical process from Song Dynasty to Yuan and Ming Dynasties, there were also many retrogressive phenomena.