China, the ancient name of railing, is also called Goulan, which is a safety facility on bridges and buildings. Railings play the role of separation and guidance in use, so that the boundaries of the divided areas are clear and definite. The railings designed are very decorative. There were balustrade-like members on the ritual vessels in the Zhou Dynasty. In the Han dynasty, lying railings were the most common. During the Six Dynasties, hooks were popular. In Yungang Grottoes and Dunhuang murals, you can find people standing at the corner of railings or looking for sticks. The wooden railings in the Yuan, Ming and Qing Dynasties are slender, while the stone railings are gradually separated from the wooden railings and tend to be heavy.
Price is the amount of money needed per unit quantity of goods when exchanging money for goods. In other words, price is the unit value (unit price). Price is the transformation form of exchange value of commodities in circulation. In the economic and commercial process, price is a value figure set for goods, services and assets in the form of money. In microeconomics, price is one of the important variables in the process of resource redistribution between demand and supply.