• Text and voice : complements, substitutes or both? 

      Andersson, Kjetil; Foros, Øystein; Steen, Frode (Working paper, Working paper, 2005)
      Text messaging has become an important revenue component for European and Asian mobile operators. We develop a simple model of demand for mobile services incorporating the existence of call externalities and network effects. ...
    • Text and voice : complements, substitutes or both? 

      Andersson, Kjetil; Foros, Øystein; Steen, Frode (Discussion paper, Working paper, 2005)
      Text messaging has become an important revenue component for European and Asian mobile operators. We develop a simple model of demand for mobile services incorporating the existence of call externalities and network ...
    • The market for consumption devices : on complementary products and seller-side revenue-extraction 

      Bergh, Harald Nygård (Working paper;40/12, Working paper, 2012-11)
      Some products and services are perfect complements to technological devices, such as video games to video game consoles. We analyze how competition between two firms selling such devices is affected by the fact that they ...
    • Why potential entry may increase platform sponsors’ profit 

      Foros, Øystein; Kind, Hans Jarle; Sand, Jan Yngve (Working Paper, Working paper, 2005-09)
      In this paper we analyze the incentives for platform sponsors to open up their networks for independent rivals. We show that open access may increase the platform sponsors’ profit levels and enhance quality improving investments.