Abstract
In the Swedish daily newspaper industry, prices of advertising space are published in a trade journal, sometimes four months in advance. We study the timing of advance publication of prices using data from 1981-1996. We find that duopolies exhibit pre-reporting behaviour that differ from monopolies. Price leadership is used frequently in duopoly markets and market share is the dominant factor in deciding the role of price leader. We find no clear relation between the use of price leadership and real price levels and conclude that the observed price leadership may be purely barometric.