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The only planet(s) without a moon is (are)
Barriers
Obstacles or impediments that prevent or hinder access to a market, including various forms such as legal, technological, or economic barriers.
Price Control
Government-imposed limits on the prices that can be charged for goods and services in the market.
Differentiating Products
The strategy of making a product or service stand out from competitors by emphasizing its unique features or qualities.
Close Substitutes
Goods or services that can serve as replacements for each other with minimal difference in utility for the consumer.
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