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DATA: Real world observations that are used to test or verify hypotheses. This is the key to the process of acquiring knowledge about the world using the scientific method. While theoretical speculation might indicate what we "think" the world is like, we don't know for sure until we compare our hypothesized view with the real world itself. Data is what adds empirical to empirical economic analysis.

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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 (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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