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EQUILIBRIUM QUANTITY: The quantity exchanged between buyers and sellers when a market is in equilibrium. The equilibrium quantity is simultaneously equal to both the quantity demanded and quantity supplied, which means that there is no shortage nor surplus in the market. This is, in fact, the prime criterion for market equilibrium. If buyers are able to buy all of the good they're willing and able to buy (no shortage) and sellers are able to sell all of the good they're willing and able to sell (no surplus), then neither side of the market is inclined to change the existing terms of trade. And that's equilibrium.

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PERFECT COMPETITION, EFFICIENCY

Perfect competition is an idealized market structure that achieves an efficient allocation of resources. This efficiency is achieved because the profit-maximizing quantity of output produced by a perfectly competitive firm results in the equality between price and marginal cost. In the short run, this involves the equality between price and short-run marginal cost. In the long run, this is seen with the equality between price and long-run marginal cost at the minimum efficient scale of production.

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