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State the assumptions of perfect competition. How does a perfectly competitive industry work in the short run and the long run? What makes perfect competition efficient?  

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State the assumptions of perfect competition. How does a perfectly competitive industry work in the short run and the long run? What makes perfect competition efficient? Assumptions behind a Perfectly Competitive Market In a perfectly competitive market it is assumes that there is a large number of small firms that all produce a homogeneous product. Firms in this market are all price-takers, where they use the selling price that it set by the price equilibrium. A perfectly competitive market also has no barriers to entry or exit; there is also perfect knowledge within the market. A perfectly competitive market must contain four characteristics in order to be perfectly competitive. These four are better described as: * There must be many buyers and sellers in the market however none of these should be able to influence the price. A perfectly competitive market usually has a small number of firms that supply to a small number...

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