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COLLUSION AND EFFICIENCY: Colluding oligopolistic firms generally produce less output and charge a higher price than would be the case for a perfectly competitive industry. In essence, colluding oligopolistic firms function just as if a market were monopolized. The price charged by the colluding firms is higher than the marginal cost of production. The equality between price and marginal cost is THE key indication that resources are allocated efficiently and that society's resources are being used to generate the highest possible level of satisfaction. Because the colluding firms control the market like a monopoly, the market demand curve is THE demand curve for the colluding firms's. With a negatively-sloped demand curve, price is greater than marginal revenue. And because a profit-maximizing firm equates marginal revenue with marginal cost, the price charged by the colluding firms when the maximize industry profit is greater than marginal cost.

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LONG-RUN AVERAGE COST CURVE, DERIVATION

The long-run average cost curve is the envelope of an infinite number of short-run average total cost curves, with each short-run average total cost curve tangent to, or just touching, the long-run average cost curve at a single point corresponding to a single output quantity. The key to the derivation of the long-run average cost curve is that each short-run average total cost curve is constructed based on a given amount of the fixed input, usually capital. As such, when the quantity of the fixed input changes, the short-run average total cost curve shifts to a new location.

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Today, you are likely to spend a great deal of time watching infomercials seeking to buy either a half-dozen helium filled balloons or a packet of address labels large enough for addresses of both the sender and the recipient. Be on the lookout for strangers with large satchels of used undergarments.
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