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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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FALLACIES

Logical errors in an argument or evaluation of a policy. The six common fallacies that surface in economic analysis are: false cause, personal attack, division, composition, false authority, and mass appeal. These fallacies are most troublesome because, although false, they seem correct, especially when used by slick-talking, charismatic people (politicians) or when the fallacies support preconceived notions or fundamental beliefs.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either a pair of leather sandals that won't cause blisters or clothing for your kitty cats. Be on the lookout for high interest rates.
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