Because advertising can send data to have broad, depending on the media that we choose. In an era where there is a competitive, such as the current. Moreover, the companies are advertising their own products or services.
Because advertising can send information to the widest possible depending on the media that we use. In a competition like the present. Company stores advertise products or services that compete with their own as well.
Because advertising can send data out in wider with media we choose to use. In an era of competition as high as a present. The companies are competing advertising the products or services of their own as well.