在相同时间、地点，同一商品的批发价和零售价之间的差值difference between wholesale and retail price

• 农业公司可以确保在尖椒生意的批零差价中赚钱。

  Agricultural companies can be sure of making money from the difference between the wholesale and retail price in the chilli pepper business.

• 随着批零差价的拉大，加油站每升汽柴油的毛利可高达7、8毛。

  As the difference between the wholesale and retail price widens, the gross profit made by petrol stations on every litre of diesel or petrol can reach as high as 7 or 8 mao.