Japanese single product refers to the original single product.
Foreign trade receipts are because when foreign big brands place orders, they will specify raw material rationing most of the time. Of course, the ration will be greater than the order demand to ensure that enough qualified products can be produced. In this way, after the order is delivered, the OEM will have some surplus, which is the so-called "tail order". Claiming that one's product is a tail order shows that the quality of one's product is no different from that of a specialty store, but it is much cheaper to attract customers. In fact, OEM companies have the right to control and manage the tail list. Why are there so many "tail orders"? Especially nowadays, online sellers, who open stores, have to call themselves "tail orders", which adds up to how many times more than the processing capacity?