Abstract
The growth of oligopoly within the newspaper industry is a widespread phenomenon which has been examined by both researchers into the mass media and public enquiries into the press in a number of countries. Politicians recognise the development and want to modify the process of concentration, prevent newspaper closures, and even promote new ventures. Many western countries have taken measures to try to control forces bearing toward concentration in the newspaper industry. Such efforts, however, require a thorough knowledge of the market and its mechanism.