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TANGENCY: A geometric condition that occurs when two curves touch at a single point with identical slopes at that point. This condition of tangency surfaces in several different areas of economic analysis, including indifference curve analysis (tangency between an indifference curve and budget line) and monopolistic competition (tangency between demand curve and long-run average cost curve). The tangency between two curves should be contrasted with the condition of intersection, in which two cross at a single point but do not have identical slopes.
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CONCENTRATION RATIOS A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.
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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for gnomes hiding in cypress trees.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
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"Stand up to your obstacles and do something about them. You will find that they haven't half the strength you think they have." -- Norman Vincent Peale
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EJ
Economic Journal
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