There are basically three commodity groups in the world: minerals, such as coal, oil, copper, zinc and bauxite; tropical agricultural products, such as cocoa, coffee, sugar, tea and tobacco; and cereals, such as rice, wheat, maize etc.

• 世界上有三种初级商品:矿产品,诸如煤、石油、铜、锌和铝矾土;热带农产品,例如,可可、咖啡、糖、茶叶和烟草;以及谷物,如稻米、小麦、玉米。