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Re:The First Big Antitrust Trial of the Century Is About to ... by prepend on Sunday August 06, 2023 @02:53PM (#37025291)
When antitrust proceedings starts against Standard Oil in 1904, they had 91% market share [0]. By 1911 when they were broken up they were down to 64%, but that’s because the case progressed. And after the breakup they had 0%.

But I think if Standard had 64% in the beginning and there was a competitive market, they would not have been broken up.

[0] https://www.visualcapitalist.com/chart-evolution-standard-oi...

Re:The First Big Antitrust Trial of the Century Is About to ... by Retric on Sunday August 06, 2023 @04:19PM (#37026188)
Which is why I said down to, they didn’t get to say we’re below the magic X% number can you please leave us alone. But presumably if their market share had fallen to 10% that would have happened.

As to when the case started, it’s impossible to know what the minimum threshold was. It could just as easily been well below 64% as people where in monopoly busting push at the time.