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Answer:e. A is perfect competition and B is monopoly.Explanation:In an economy with a perfectly horizontal line which is line A that is where firms are actually price takers in a perfect competition market therefore here even if the quantity demanded in the market is a certain number the price does not change as there are many companies that are actually producing that good therefore they compete perfectly at a certain price.The downward sloping line is where a certain firm is producing and providing a certain good to consumers alone where price of a good varies with the quantity demanded and this market is a monopolistic market....