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EXCESS CAPACITY: A condition that exists when monopolistic competition achieves long-run equilibrium such that production by each firm is less than minimum efficient scale. The implication of this condition is that each firm is not producing up to its fullest capacity, as would be the case under perfect competition, and thus more firms are need to produce total market output compared to perfect competition. Excess capacity results because market control means a monopolistically competitive firm faces a negatively-sloped demand curve. Long-run equilibrium is thus achieved by the tangency of the negatively-sloped demand curve and the long-run average cost curve, which results in economies to scale.

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PRICE INDEX

A measure of the average of a group of prices calculated as a ratio to prices in a given time period (that is, a base year). A price index is primarily used to compare relative prices, or changes in the group prices over time. Such an index is a handy indicator of overall price trends. Two common price indexes that surface in the study of macroeconomics are the Consumer Price Index (CPI) and the GDP price deflator. Both are used to indicate the macroeconomy's average price level and to estimate the inflation rate. The Dow Jones Industrial Average (the Dow), Standard & Poor's 500, and the NASDAQ are well-known indexes of stock market prices.

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