Many commodities are like this. If the supply of such commodities in the market exceeds the demand, the price will increase, but if the supply exceeds the demand, the price will decrease.

Cardamom is a plant of Musaceae and Cardamom. Mainly produced in Vietnam, Thailand and other places, but also cultivated in Guangdong, Guangxi and Yunnan. The original plant was born in the forest with warm and humid climate and rich humus. It has pungent taste and warm nature, and belongs to the lung, spleen and stomach meridians. It has the effect of eliminating dampness, promoting qi circulation, warming the middle warmer and stopping vomiting. It is called Cardamom in clinic. The stems are clustered, the plant height is 3 meters, and the leaf sheath at the base of the stems is green. Leaf blade ovate-lanceolate, about 60 cm long, 12 cm wide, top and tail tip, smooth and hairless on both sides, nearly sessile; Ligule round, 7- 10 mm long; Leaf sheath mouth and tongue are densely covered with coarse hairs.