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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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MONOPOLISTIC COMPETITION, CHARACTERISTICS

The four key characteristics of monopolistic competition are: (1) large number of small firms, (2) similar but not identical products sold by the firms, (3) relative freedom of entry into and exit out of the industry, and (4) extensive knowledge of prices and technology.

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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either a how-to book on home decorating or a set of luggage with wheels. Be on the lookout for slow moving vehicles with darkened windows.
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