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John D. Rockefeller had a monopoly on the oil market in the 1880's. Considered the wealthiest American of all-time.

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the American Telephone and Telegraph Company. In 1982, AT&T was found to be in violation of U.S. antitrust law while acting as the sole supplier of telephone services to the country. As a result, it was forced to split into six subsidiaries, known as baby bells

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designer belts are a oligopoly due to brand loyalty of the belts making it hard for new companies to get a slice of the market. The companies that are part of this oligopoly are gucci, louis vutton , channel... any brand put in a rap song.

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AT&T is an example of a Oligopoly. Like AT&T, there are many competitors that give near the same service, but different in their own practices. Competitors would be Verizon, Sprint, or T-Mobile.

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Hairdressers are always in demand but there is chains like sports cuts and super cuts with more efficient pricing and decent quality to where other firms must rely on things like customer service and better quality for cheaper to get ahead

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Fast-food restaurants would be an example of monopolistic competition. There Are many fast-food restaurants and they offer different food, such as the difference between McDonalds and In-and-Out. One sells only burgers while the other is known for burgers and chicken nuggets.

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Growing crops would be an example of pure competition. Growers put out what they put in. It is easy to enter the market as the demand is almost always there, but as terms of profit goes, everyone is different.

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restaurants (not fast food) anyone can start a restaurant and due to the demand and curiosity of consumers they're will always be a some sort of demand for any restaurant and owners can set prices for certain competitive foods  to a place where demand will increase.