Because the products may be lower than on the negative aspects of an opponent. And said about the positive aspects of their product. It makes sense to use this method of advertising.
Because the products may contain negative aspects of klang on an opponent and said about their product's positive, it is appropriate to use this method in advertising.
because in the product may have a lower negative about ways of his opponent and said about positive ways of their products are suitable to be used in this way, advertising