Until now, the advertising industry's new media-buying processes have been virtually hidden to all but a relatively few practitioners in the field. No books have been written about the business, and while some excellent trade publications follow its developing story continuously, the particulars they present are more or less opaque to those outside the industry. A few experts in the media-buying field, in fact, told me that they don't try to explain the details of what they do to their clients, the advertisers, or their bosses in the upper reaches of their advertising agencies. They simply wouldn't grasp it. All the clients and the bosses care about, these media buying experts added, is whether they reach their targets with an appropriate return on investment. But from a consumer perspective, from the standpoint of a society aiming for transparency and fairness, this black-box approach is not acceptable.