4. To persist, a monopoly must be protected by a barrier to entry. This can take the...
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4. To persist, a monopoly must be protected by a barrier to entry. This can take the form of control of a natural resource or input, increasing returns to scale that give rise to natural monopoly, technological superiority, or government rules that prevent entry by other firms, such as patents or copyrights.
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Essentials Of Economics
ISBN: 9781429218290
2nd Edition
Authors: Paul Krugman, Robin Wells, Kathryn Graddy
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