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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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SUPPLY SHOCK

A disruption of market equilibrium caused by a change in a supply determinant and a shift of the supply curve. A supply shock can take one of two forms--a supply increase or a supply decrease. This is one of two disruptions of the market. The other is a demand shock.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club hoping to buy either a set of hubcaps or handcrafted decorations to hang on your walls. Be on the lookout for defective microphones.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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