The patriarchal system stipulates that the eldest son's line is the big line, and the remaining descendants are the small line. The throne of the emperor is hereditary to the eldest son, who is called the Dazong; the remaining sons are called the Xiaozong to the emperor. The position of princes is also hereditary to the eldest son, who is the major clan in his country; the remaining sons are the minor clan to the princes. This applies to ministers, officials, scholars, and common people. "Book of Rites. Mourning Clothes": "Those who are more serious about the big sect will descend to the small sect." "Book of Rites. Da Zhuan": "Bie Zi is the ancestor, the successor is the sect, and the one who succeeds you is the small sect." Kong Yingda Shu: "Bie Zi is also called the bastard of the princes... The one who succeeds you is called the Xiaozong. It is said that the legitimate son of the father succeeds you. The brothers follow it and call it the Xiaozong." Liu Dahuai of the Qing Dynasty wrote in the "Stele Inscription of the Cheng Family Ancestral Hall": " The ancestor of the Cheng family, Yonghe, built a shadow hall and later inherited it as the shrine of Xiaozong."

What is the bulk commodity? Bulk commodities refer to material commodities that can enter the circulation field, but are not retail links, and have commodity attributes and are purchased and sold in large quantities for industrial and agricultural production and consumption. In the financial investment market, bulk commodities refer to commodities that are homogeneous, tradable, and widely used as basic industrial raw materials, such as crude oil, nonferrous metals, agricultural products, iron ore, coal, etc. It includes 3 categories, namely energy commodities, basic raw materials and agricultural and sideline products. Commodities that can be traded in futures in China include: Shanghai futures: copper, aluminum, zinc, natural rubber, fuel oil, gold; Dalian futures: soybeans, soybean meal, corn, soybean oil, palm oil, and plastics. Zhengzhou Futures: hard wheat, strong gluten wheat, sugar, cotton, PTA, rapeseed oil, etc.

Small commodities are relative to bulk commodities. It is a commodity that can enter the circulation field and is mainly sold for retail and small transactions, such as accessories, toys, stamps, old versions of RMB, traditional Chinese paintings, ginger, garlic and Tianqi, etc., which are all small commodities.