Constant availability boosts sales!

Products exhibited for sale must be of good quality and be available at a place and at the fixed time without any interruption in their supply. Then those products will be thought of each time and remembered by the people to buy them again and again - that boosts the sales of them.

Popular Man and Popular Products!

First become known to all before being remembered and recognized. If you present yourself before others, they will see you, inquire you and get the personal information. Later you shall have to revisit them to be remembered or recognized. If you repeat on such visiting them, you will be permanently retained in their memory for their entire life time. Then you shall be a popular person in their circle!
Similarly, note that in business, products have to be shown to the customers with full demonstration about their usage repeatedly, before being accepted as worthy, and bought - to make it to become a popular one!