what is an example of a current oligopoly 
one measure that shows if an oligopoly is present is the concentration ratio which calculates the size of companies in comparison to their industry instances where a high concentration ratio is present include mass media in the u s for example the sector is dominated by just five companies nbc universal walt disney time warner viacom cbs and news corporation even as streaming services like netflix and amazon prime begin to encroach on this market meanwhile within big tech two companies control smartphone operating systems google android and apple ios 