Advertising has already become a very specialized activity in modern times. In today's business world, supply is usually greater than demand. There is great competition between manufactures of the same kind of product because they want to persuade customers to buy their particular brand. They always have to remind their customers of the name and qualities of their products by advertising. The manufactures advertises in newspapers and on the radio. He sometimes employs salesgirls to distribute samples of his products. He sometimes advertises on the Internet as well. In addition, he always has advertisements put into television programs that will accept them. Manufacturers often spend huge sums of money on advertisements. We buy a particular product because we think that is the best. We usually think so because the advertisements say so. People often don't ask themselves if the advertisements are telling the truth when they buy advertised products from shops.