The Association of Software Makers,which does not include all software producers,refuses to deal with any parties who do not carry the products of its members.Under the Sherman Act,this is

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Refusing to deal with non-members only if it eliminates competition or prevents entry into a given market is considered a per se violation under the Sherman Act. However, if it can be shown that the action does not significantly harm competition, it may be subject to the rule of reason.

The Association of Software Makers,which Does Not Include All Software