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Windows is a monopoly because they can exercise their prices, they participate in non-price competition, and they are the only seller of their unique software.

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Microsoft is a monopoly because they are the only firm with their unique PC software, they exercise their prices, and they use non-price competition (advertisement).

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Cruise lines are a good example of an oligopoly market because there are few firms in the industry, they have complete control over the prices, and the industry is hard to join.

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Car manufacturers are a good example of an oligopoly market because there are few firms in the industry, sellers have significant control over the price change, and it's hard to join the industry.

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Make up companies are a monopolistic competition because each company differentiates their products as better from other products, they can easily raise their prices, and they engage in non-price competition.

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Toothpaste is a monopolistic competition product because their firms engage in non-price competition, they can easily change the prices of their products, and it is easy to open a business of this type.

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Wheat is a pure competition product because many firms grow/produce it, its easy to star growing it, and there is no non-price competition

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Corn is a pure competition product
because its easy to start growing, they are very similar to others in its area, and non-price competition is not helpful.