Principles of Microeconomics / Unit 10 MIC 0905 short lesson, about 20 seconds
Market Definition and Actual Competition
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The idea
Both measures assume the market is correctly defined, and that is where disputes live. Technology and globalization widen markets, and agencies also weigh evidence of actual competition, such as prices where rivals overlap.
In practice
A grocery chain's merger judged on store-level prices rather than a share.
Where people slip
The same merger can trip a threshold on one market definition and clear it on another.
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