At the beginning of Duke Huan of Qi’s struggle for hegemony, all the wastes had not yet been revived, and the national power was not strong. After the Battle of Changshao, Qi Huangong was unwilling to fail, and in the summer of that year, he united with the Song Dynasty to attack Lu again. The State of Lu defeated the State of Song first with lightning speed, frightening Duke Huan of Qi to withdraw his troops. Duke Huan of Qi could not defeat Lu militarily, so he adopted Guan Zhong's strategy to defeat Lu economically. Do you know what the plan is?

It is said that Guan Zhong, in view of the people of Lu who were good at weaving silk, asked Duke Huan of Qi to wear clothes made of silk and show them off everywhere. People in Qi State saw Duke Huan of Qi wearing silk clothes, so they imitated him one after another, and the silk clothes on the market became a hot commodity. The state of Qi kept buying silk ribbons from the state of Lu at high prices. The people of the state of Lu saw that weaving silk ribbons could make a lot of money, so they weaved silk ribbons one after another and sold them to the state of Qi. Today's Jinan area is located between Qilu and Qilu, and is a relay station for merchants from Qilu and Lu. After more than a year like this, the State of Qi suddenly banned the purchase and wearing of Lu's silk clothes. It also ordered all pass fortresses to cut off economic exchanges with the State of Lu and impose an economic blockade on the State of Lu. The Jinan area is an important blockade. At this time, the state of Lu was dumbfounded. The people had been weaving silk tapestry for a year, and at the same time they had left the land uncultivated for a year. So the state of Lu began to suffer from food shortages, its soldiers were not strong, and its horses were not strong either. At this time, the State of Qi began to export grain to the State of Lu, at a cost of one thousand yuan per stone, while in Qi it was only ten yuan per stone. So the people of the State of Lu moved to Qi to live, and the State of Lu lost a lot of labor force. In this way, Lu's economy collapsed rapidly and turned into a poor and backward country. In the winter of 682 BC, Duke Zhuang of Lu took the initiative to seek an alliance with Duke Huan of Qi to make peace when there was no war between Qi and Lu. From then on, Lu obeyed Qi's orders, and Qi won without a fight.

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