So? Most U.S. momoply/antitrust cases are tried in courts below the Supreme Court. Again, monopolies are generally considered anything over 50% share.
Monopolies are NOT generally considered anything over 50% share. As
Case 4:20-cv-05640-YGR Document 812 Filed 09/10/21 documents 65% is the bare minimum and the Supreme Court goes with 75%
From the United States DOJ archives:
Some courts have stated that it is possible for a defendant to possess monopoly power with a market share of less than fifty percent. These courts provide for the possibility of establishing monopoly power through non-market-share evidence, such as direct evidence of an ability profitably to raise price or exclude competitors. The Department is not aware, however, of any court that has found that a defendant possessed monopoly power when its market share was less than fifty percent. Thus, as a practical matter, a market share of greater than fifty percent has been necessary for courts to find the existence of monopoly power.
The reference to that is:
"See Hayden Publ'g Co., Inc. v. Cox Broad. Corp., 730 F.2d 64, 69 n.7 (2d Cir. 1984) ("[A] party may have monopoly power in a particular market, even though its market share is less than 50%."); Broadway Delivery Corp. v. UPS, 651 F.2d 122, 129 (2d Cir. 1981) ("[W]hen the evidence presents a fair jury issue of monopoly power, the jury should not be told that it must find monopoly power lacking below a specified share."); Yoder Bros., Inc. v. Cal.-Fla. Plant Corp., 537 F.2d, 1347, 1367 n.19 (5th Cir. 1976) (rejecting "a rigid rule requiring 50% of the market for a monopolization offense
without regard to any other factors")."
Please note that the California ruling sited later cases (the youngest was 1986) and when looking up that "Some courts have stated that it is possible for a defendant to possess monopoly power with a market share of less than fifty percent." part I got the Department of Justice Archives which warns "This is archived content from the U.S. Department of Justice website.
The information here may be outdated and links may no longer function."
Also that page has this:
"Following
Alcoa and
American Tobacco, courts typically have required a
dominant market share before inferring the existence of monopoly power. The Fifth Circuit observed that "
monopolization is rarely found when the defendant's share of the relevant market is below 70%." Similarly, the Tenth Circuit noted that to establish "
monopoly power, lower courts generally require a minimum market share of between 70% and 80%." Likewise, the Third Circuit stated that "a share significantly larger than 55% has been required to establish prima facie market power" and held that
a market share between seventy-five percent and eighty percent of sales is "more than adequate to establish a prima facie case of power."
Apple is in California and that is where the case will be decided and that court has already gone with the later (minimum of 65% and 75% for conservative) section.