US History: Chapter 7, Exercise 3 — Possible Solution
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THE COMPLICATION
Standard Oil's market share peaked at about 90 percent in 1880 and had fallen
to about 64 percent by the 1911 breakup, partly from competitors expanding
into new oil regions. So the company was not stopped at the height of its
dominance.

WHY THIS DOES NOT SETTLE THE QUESTION
A declining share does not mean the company was no longer engaging in
anticompetitive practices; the Court's ruling addressed conduct, and the
chapter does not have the legal reasoning needed to judge whether the
breakup was still justified at 64 percent.