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Word Count: 794
Perfect competition is a market structure characterized by a large number of buyers and sellers of essentially the same product The firms produce a standardized product and there is a free entry and exit of these firms to and from the industry The firm in a purely competitive market faces a perfectly elastic demand curve at the price determined by equilibrium in the market Hirschey 379 The firm in a short-run supply curve is the short-run marginal cost curve above the minimum point on the average variable cost curve also known as the shutdown point In the short run firms behave differently than in the long-run It is important to remember that a profit-maximizing firm always produces where marginal cost is equal to marginal revenue When a firm is small relative to the market and its product is indistinguishable from the product of other firms the firm views itself as having no influence on the market price In perfect competition if a firm wants to sell any of its output it must sell at the market price which is referred to as a price taker When a market is in equilibrium the purely competitive firm can sell as much of the product as it wishes From the firms viewpoint this means it faces a perfectly elastic demand curve As demand increases the firm will move up its marginal cost curve Another increase in market demand would cause the firm to move further up its marginal cost curve The higher price would lead it to supply more output However by doing this the firm is suffering a loss which means factors could earn more in some other use The opportunity costs are not being met However since this is the short run that means that some factors are fixed The fixed factors represent the fixed costs and cannot be removed Fixed costs must be paid in the short run even if the production ceases
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