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Concentration phenomena concern the ICT market. Though the regulatory actionhas been active mainly in the telecom network operators industry, even moresignificant worldwide concentration phenomena affect other industries. Themarket of mobile operating systems is analysed through two concentrationindices to get a quantitative picture of the current situation and itsevolution over time: the Hirschman Herfindahl Index (HHI) and the Four-FirmConcentration Ratio (CR4). A strongly imbalanced oligopoly is shown to exist,where the four major operating systems take over 99% of the market, but thedominant operating system Android alone is installed on over 80% of the newdevices.

Concentration in the mobile operating systems market