Source : Free On-Line Dictionary of Computing

IBM discount
     
        A price increase.  Outside IBM, this derives from the common
        perception that IBM products are generally overpriced (see
        {clone}); inside, it is said to spring from a belief that
        large numbers of IBM employees living in an area cause prices
        to rise.
     
        [{Jargon File}]
     
        (1995-02-07)