Commodity difference refers to the price difference between the same product due to different circulation links, purchase and sales regions, purchase and sales seasons, and different quality. Which of the following are commodity spreads:. ['Two dollars a pound for the green onions in winter and one pound a penny for the green onions in summer.', 'In the same building, the price of the rough room and the refined decoration room is very different.', 'The price of a box of the same medicine produced by two pharmaceutical companies is a difference of 3 yuan.', 'Because Jiadi Pear is more expensive than Jiadi.']