It is pointed out in the passage that ……………

An Advertising Agency is an organisation which undertakes to handle advertising on behalf of the advertiser. It employs artists, copy writers, etc., who are specialists in the field. Its staff are also specialists in buying space in newspapers, or time on radio and television. They are usually able, therefore, to do a far more professional job than the advertising manager who belongs to a firm and who therefore has a limited experience. However, many firms now employ an advertising manager as well to co-ordinate the things with the agency for the advertising campaign of the firm.