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BY-PRODUCT: One of two goods that are produced jointly using the same resource--that is, the production of one good automatically triggers the production of the other. Also termed joint products or complements-in-production, the phrase by-product is often used when one of the products is unwanted or of secondary importance. For example, sawdust is generally considered a by-product from producing lumber from trees.

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PERFECT COMPETITION, SHORT-RUN PRODUCTION ANALYSIS

A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This production level can be identified using total revenue and cost, marginal revenue and cost, or profit. Because a perfectly competitive firm faces a perfectly elastic demand curve, it efficiently allocates resources by equating price and marginal cost. In addition, the marginal cost curve above the average variable cost curve is the perfectly competitive firm's short-run supply curve.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a birthday gift for your father that doesn't look like every other birthday gift for your father or a green fountain pen. Be on the lookout for slow moving vehicles with darkened windows.
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Two and a half gallons of oil are needed to produce one automobile tire.
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