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LONG-RUN TREND: The general movement over time of particular measurement, especially one prone toward shorter term fluctuations. One of the most important long-run trends in the study of macroeconomics is for real GDP. The long-run trend of real GDP, which has historically increased about 3% a year, indicates the increase in the economy's production capabilities. Such capabilities have increased due to increases in the quantity and quality of resources.

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ECONOMIES OF SCALE

Declining long-run average cost that occurs as a firm increases all inputs and expands its scale of production. Economies of scale result from increasing returns to scale and are graphically illustrated by a negatively-sloped long-run average cost curve. Economies of scale usually occur for relatively small levels of production and are then overwhelmed by diseconomies of scale for relatively large production levels. Together, economies of scale and diseconomies of scale create a U-shaped long-run average cost curve.

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