Barros, Pedro; Kind, Hans; Nilssen, Tore; Sørgard, Lars - In: Topics in Economic Analysis & Policy 4 (2005) 1, pp. 1343-1343
apply the model to analyze competition between Internet portals and find that equilibrium prices of advertising are higher … the less differentiated the portals are perceived to be. Moreover, we find that the portals' aggregate profit increases if … advertising space. But if the portals are close substitutes, then it is profitable for one of the portals not to combine with an …