The Guanzi (Chinese: 管子) 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). Despite its later dating, it is arguably one of the most representative texts of the concepts of political economy that developed during the Spring and Autumn period. Source: Wikipedia (en)