![]() OligopolyĪn oligopoly firm also does not have a supply curve. Therefore, there is no one-to-one relationship between quantity and price-a monopolistic market has no supply curve. With a change in demand curve, a monopolist can either produce the same quantity but charge a different price or charge the same price but produce at a different quantity. In a monopolistic market, there are instances where changes in demand curves do not produce a change in both price and quantity (P and Q). Therefore, in the long run, the supply curve of a firm is the portion of the firm’s long-run marginal cost curve above average total cost. The long-run market supply curve indicates the minimum price at which firms will supply various market output levels, given sufficient time both to adjust plant size and to enter or exit the industry In the long-run, it doesn’t make sense for the firm to operate below average total cost (ATC). In the graph below, the blue line from the point above AVC represents the short-run supply curve. The marginal cost curve is a J-shaped curve. The average total cost curve is also U-shaped. ![]() Remember that average variable cost curve is U-shaped. ![]() This is because in the short-run, in order to be able to operate, the firm should recover its variable cost. The industry supply curve is also positively sloped, i.e., as the prices increase, the quantity supplied increases.Ī firm’s short-run supply curve is the portion of the firm’s short-run marginal cost curve above average variable cost. In perfect competition, the supply curve of an individual firm is positively sloped.
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