Does higher market share mean higher profitability?
Core argument: Of the industry-leading public firms in the dataset, 90 companies—56%—have profit margins below their industry median, and it is rare for the number-one company in an industry to earn far above-market margins.
Market share is not a consistent indicator of firm performance. This finding holds true across industries, with many illustrating a negative relationship between market share and profitability. Companies earn their market share through a better product, better pricing, better service, or a litany of other firm-specific strategic decisions. It's actually quite rare to see the number-one company in an industry earning far above-market profit margins. In our dataset, 90 companies—or 56% of the industry-leading public firms—have margins below the industry median.

