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 are > alternatives, it just involves up front investment to move to it.
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