Commodity difference: refers to the price difference between the same product due to different circulation links, quality, purchase and sale regions and seasons. According to the following definitions, Which of the following options that are not commodity spreads are:. ['It is more expensive to buy the same phone in Changsha than in Yueyang.', 'The Chinese cabbage in the morning market is a pound a pound, and you can buy it at eight cents in the afternoon.', 'Haier TVs and TCL TVs have different prices.', 'Northeast rice is cheaper to sell in Northeast than in Hunan.']