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Example: Diamonds - De Beers
Explanation: This company used to control the diamond market, by controlling prices and streaming all the world's rough suppliers to sell production through the De Beers channel.

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Example: Microsoft
Explanation: Many software products are only compatible with Microsoft's Windows operating system, and people are very unlikely to pay for a new software or learn how to use that new software.

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Example: Cell phone companies
Explanation: A few cell phone companies dominate the entire industry, making it hard for other brands to enter into the market. The main cell phone providers are Sprint, AT&T, and Verizon.

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Example: Automobile industry
Explanation: The fixed costs of automobile manufacturing are very high, limiting the number of firms that can enter into the market

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Example: Restaurants
Explanation: Product differentiation is a huge thing with restaurants, because people choose them based off of how good their food is.

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Example: Toothpaste
Explanation: This type of market structure contains suppliers that try to differentiate their products slightly from other products. Toothpaste for example, will sometimes differ from other toothpastes by claiming to make teeth whiter or prevent periodontal disease.

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Example: Wheat
Explanation: Agriculture is a good example in general of pure competition. Wheat specifically, because it's sold by many farmers for around the same price and product.

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Example: Corn
Explanation: Farmers of corn are numerous, but basically sell the same thing, therefore it's a competitive market.