In ancient China, most countries or dynasties implemented the policy of restraining business, with Qi as an exception. Since Jiang Ziya's time, the State of Qi has a tradition of attaching importance to commerce. When it arrived in Guanzhong, it spared no effort to develop commerce. He believes that business promotes the circulation of goods, and the government should use businessmen to achieve price control. Guan Zhong also has a view that money is not real wealth, only goods are real wealth. A country should try to keep its own resources at home, and at the same time transfer the wealth of other countries to its own country through businessmen. This is a real power, called "keeping the wealth of the country at home and making the world outside." This is different from our policy today. We are now an export-oriented economy, and export resources are exchanged for foreign currency. When foreign currency depreciates, our money is a pile of waste paper. When resources are scarce, we may not be able to buy back the same amount of resources with double or more money. Therefore, Guan Zhong encouraged Chinese and foreigners to do business in Qi. He divided the Qi people into agriculture, industry, commerce and other industries, which were handed down from generation to generation. In the long run, although it restricted the cross-industry flow of personnel, it promoted the development of the industry at that time. At the same time, we will give preferential treatment to businessmen who come to Qi to do business. It is stipulated that different amounts of rewards will be given according to the turnover. At the same time, Qi engaged in the entertainment industry, and built the earliest official brothel in China, with the aim of attracting foreign businessmen to do business in Qi. So businessmen gathered all over the world, ranking first among the princes and having sufficient materials.

Internationally, Guan Zhong fought an economic war. Qilu is a neighboring country. At first, the fief was almost the same size. One is the descendant of the Duke of Zhou, and the other is the descendant of Jiang Ziya. Lu became Guan Zhong's first target. Shandong textile technology is developed, and the silk woven is fine and fine, which is famous all over the world. Guan Zhong asked the King of Qi to wear clothes made by Lu Mao, and encouraged all Qi people to wear Lu Mao, and encouraged businessmen to import Lu Mao in large quantities. In this way, Lu people saw that weaving was profitable and gradually developed into a pillar industry. Mulberry trees and silkworms were planted in the fields, and a large number of farmers engaged in Shandong production, while agricultural production was abandoned. Guan Zhong saw that the time was ripe, so the King of Qi ordered that Qi people should not wear Lu Tao. As a result, the economy of Lu was hit hard, the export-oriented economy plummeted, and food prices rose sharply. Lu was forced to collapse and surrendered to Qi without fighting.

Similar economic wars were directed by Guan Zhong many times, once against Chu. Chu is a powerful country and an enemy of Qi. Guan Zhong asked the King of Qi to raise deer, bought a lot of deer from Chu at a high price, and dumped food in Chu at a low price. The price of Qi soared, the price of deer soared, and Chu people went into the mountains to hunt deer. Catching a deer is equivalent to planting a few acres of land, so farmers in Chu abandoned their fields to catch deer. Seeing that the time was ripe, Guan Zhong suddenly banned grain export and deer breeding, and the existing deer were exported in large quantities and resold at low prices. As a result, the price of deer fell sharply and no one wanted it, but the price of food soared. The Chu people had no money to buy food and fled. The king of Qi sent troops to attack Chu, and the hungry Chu soldiers chickened out, so the king of Chu had to give up and make peace. This war established the hegemony of Qi.

Such a classic economic war, as well as the acquisition of foreign foxskins, and so on.