IBM does have an effective monopoly on the 5250 data stream.
IBM does not have an effective monopoly on database serving, web
serving, etc.

Hence the difference in pricing.

Are they a monopolist in the Sherman Antitrust Act sense, no.

Andy Nolen-Parkhouse

> They are not a monopolist.  Proprietary, yes, monopolist, no.  There
> alternatives, it just involves up front investment to move to it.

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