The correct answer is b. sufficient strength to prevent or discourage potential competitors from entering the market.
These obstacles include economies of scale that result in natural monopolies, the management of a physical resource, limits on competition imposed by law, protection of patents, trademarks, and copyrights, and tactics to scare rivals such predatory pricing. These gains ought to spur intense rivalry as outlined in Perfect Competition, but due to one specific monopolistic feature, they do not. Entry barriers are the societal, economic, or technical factors that deter or forbid potential rivals from joining a market. A monopolistic competitive industry has minimal entry requirements, and actions made by any one business do not immediately impact those of its rivals. The price and marketing choices made by the rival firms serve as their points of differentiation.
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