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The post office was one beofre the the new post offcie came out which are Fed EX, PSU. Its when a single firm is the only producer or seller of a product that has no close substitute.

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Public water or bottled water is a type of monopoly because people have water in their living homes and have the decision to buy some at a store. There number of sellers is one and the variety goods is none. And the entry in the market is complete barriers.

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AT&T has a high infrustation cost that goes wtih each capital unit for the sales connected to the economy. And the homogeneous good and high competition within the pricing strategies.

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T-mobile has an amount of selllers and with the number its about a few demonates. The vairety goods that come with it as well is some of it not all. The price control for T- moble is some and for the high barriers into the entry into market.

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Conr has a large number of firms with a homegenous product with no power and price taker. As well corn had a perfect Information.

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Wheat is a market wtih no power, but has a large number of firms. Wheat is also a homogenous product with a price taker.

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Samsung has increase in the price of an input of a phone as well a decrease in the demand of mobile phones.

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Iphone have firms thatare large number of sellers. The sellers have small market shares, and does not corporate with each other, and independent. Their firm is they have product differentiation.