商品差价的本质是供求变动差价●汪旭在商品流通中存在着商品差价，也就是说，同一种商品由于购销地点、购销季节、购销环节以及质量的差异而存在价格差额。商品差价主要有地区差价、季节差价、质量差价、环节差价（购销差价、批零差价）等。商品差价，实质上是商品在流通... The essence of commodity spread is the difference between supply and demand. ● Wang Xu has commodity spreads in the circulation of commodities. That is to say, the same commodity has price differences due to differences in the locations of purchases and sales, seasons for buying and selling, and the links between purchases and sales, and quality. Commodity spreads mainly include regional price difference, seasonal price difference, quality price difference, link price difference (purchasing and selling price difference, wholesale and retail price difference) and so on. Commodity spreads are essentially commodity circulation...