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pure competition
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large number of firms producing standardized product; individual firms can react to price changes but cannot change the market price
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pure monopoly
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one firm is the sole seller, blocked entry to other firms, no effort to differentiate product
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monopolistic competition
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large number of sellers selling differentiated products, widespread nonprice competition
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oligopoly
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few sellers, standardized OR differentiated product; each firm is affected by decisions of its rivals
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imperfect competition
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combination of pure monopoly, monopolistic competition, and oligopoly
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price taker
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seller/buyer that is unable to affect price of a product/resource that is being supplied/bought
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average revenue
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TR divided by Quantity sold
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constant-cost industry
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expansion by entry of new firms has no effect on production/resource costs
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increasing-cost industry
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expansion by entry of new firms raises production/resource costs for firms
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decreasing-cost industry
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expansion by entry of new firms lowers production/resource costs for firms
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natural monopoly
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largest supplier in a market has overwhelming cost advantage over competitors
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marginal revenue
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change in total revenue resulting from sale of one additional unit of product (change in total cost/change in quantity sold)
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total revenue
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total number of dollars received by a firm/firms from the sale of a product