The Guanzi () is an ancient Chinese political and philosophical text. At over 135,000 characters long, the Guanzi is one of the longest early Chinese philosophical texts. This anonymously written foundational text covers broad subject matter, notably including price regulation of commodities via the concept of "light and heavy" (轻重). It is one of the most representative text of developing concepts of political economy Warring States era. The Guanzi is named for and traditionally attributed to the 7th century BCE philosopher and statesman Guan Zhong, who served as Prime Minister to Duke Huan of Qi. It was, however, written by several anonymous authors. While the precise date of creation remains subject to historical debate, it is "arguably a much later expression of ideas in the direction of the Han Feizi", and may not have been compiled until after the Han Feizi (mid 3rd century BCE). The Han Dynasty scholar Liu Xiang edited the received Guanzi text circa 26 BCE. It contains a wide variety of material from many different authors over several successive centuries, largely associated with the 4th century BCE Jixia Academy in the Qi capital of Linzi. The Ming dynasty agricultural scientist Xu Guangqi frequently cited the Guanzi and the Xunzi. As is typical of an ancient Chinese text, the organization of the Guanzi has been altered over time, both the chronology and significance of which isn't all that clear. Covering a wide variety of subjects, ranging from detailed economic discussions to overviews of local soil topography, many chapters include Confucian values as a necessity for the state, expressing a blend of what may be considered Legalistic, Confucian, and Daoistic philosophy that has been termed "Huang-Lao". The first reference to the collection appears in the more Daostic Huainanzi, of the early Han dynasty, and Han bibliographies listed the text as Daoist. For example, the Neiye ("Inner Enterprise/Training") chapter has the oldest recorded descriptions of Daoist meditation techniques.