It is difficult to generalize about the impact of the libel regime on the magazine industry as a whole, because the industry is so heterogeneous in character. Magazines vary by size of circulation, from radio and television listings magazines, each selling over three million copies weekly, and consumer magazines like Woman's Weekly, selling over one million, to special interest or fringe political magazines selling a few thousand copies. They vary also by frequency of publication: weekly, fortnightly, monthly, quarterly, biannually, annually. Some are owned and published by subsidiaries of multinational corporations and are sold in significant quantities in other countries. Some are extremely parochial, or struggle to survive financially from issue to issue. With recent technical developments in desktop publishing and printing, the relatively much greater ease and lower cost of producing a magazine in the first place have encouraged the launching of new publications, including those for very small potential markets. Accordingly, the birth and death rate of magazines is much higher than is the case in other media.
In terms of numbers of published titles of all kinds, the industry is made up of many hundreds of publishers responsible for one or perhaps two magazines, spread all over the country. However, in terms of total numbers of copies sold or in terms of turnover, employment, and the other normal measures of size in the media, the magazine industry is heavily concentrated in London and the south-east. It is also dominated by half a dozen