In fact, the reason why fruit vendors like to put bananas hanging up to sell, on the one hand, is to attract the attention of customers, but also a sign. Passers-by saw the bananas hanging on the head of the door, they know that there is a fruit store, want to buy fruit to go there on the right. This practice is particularly attractive, and it is a free signboard of sorts. But in addition there is a very important reason.