and later State of Qin followed up the buying. The price then jumped sharply and, as a result, almost all household in State of Hengshan switched to make weapons instead of farming. One year later, Guan ordered officials to buy rice from State of Zhao, at a price more than three times higher than normal. By seeing the potential huge profit, State of Hengshan sold its rice inventory to officials from State of Qi. Afterwards, Guan suddenly ordered State of Qi's army to invade State of Hengshan. With selling out of weapon and rice, State of Hengshan soon surrendered. Some historians marked Qi-Hengshan War the early form of Economic Warfare. Publications He composed the Guanzi encyclopedia, officially compiled by the Jixia Academy during the Warring States period. In popular culture Guan Zhong is one of 32 historical personages featured in the Koei game Romance of the Three Kingdoms XI, where he is referred to as Guan Yiwu. References External links 720 BC births 645 BC deaths 7th-century BC Chinese people 8th-century BC Chinese people Chinese chancellors Chinese encyclopedists Chinese jurists Chinese reformers Legalism (Chinese philosophy) Philosophers of law Politicians from Fuyang Theoretical historians Zhou dynasty philosophers Zhou dynasty politicians Qi (state)