However, there are many people who may buy some consumer products because of their qualities although some companies do not spend too much money on the advertising. For instance, Selsun shampoo is a good anti-dandruff shampoo. It is well-known as a medical dandruff treatment but there is less advertising than other anti-dandruff shampoo brands, such as Head and Shoulders and Clinic Clear. Furthermore, the high sales of the Selsun shampoo does not reflect on the power of the advertising.