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Mineral Spring Monopoly and the Importance of Market Definition

The case of a mineral spring owner illustrates how market definition dictates perceived monopoly power. If the market is narrowly defined as 'that specific mineral water,' the owner is a monopolist with 100% market share. However, if the market is broadened to include 'mineral waters with high bicarbonate,' their share might drop to 20%. Expanding the market further to 'all mineral water' or 'all bottled drinks' would reduce their calculated market share and perceived market power even more.

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Updated 2025-10-07

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