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July 12, 2025 

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MARGINAL COST: The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost, usually abbreviated MC, is found by dividing the change in total cost (or total variable cost) by the change in output.

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FREE RESOURCE: A resource is free if it can produce all of the goods people want or need it to produce... and then some. Being free, however, doesn't mean a resource is not limited. Maybe it's free because people just can"t figure out what to do with it. Or if it is used for production, people don"t want all that's produced. For most of the time across most of this planet air is a free good. In other words, there is plenty of air to go around, plenty of air to satisfy all of the existing wants and needs. Does this mean that air is NOT valuable? Quite the contrary. Air is extremely valuable. It provides one of the most important inputs into human life. It's a free resource because there's enough to go around.

     See also | scarcity | opportunity cost | goods | services | wants | needs | satisfaction | scarce good | free good | scarce resource |


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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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