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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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IMPLICIT COLLUSION

Seemingly independent, but parallel, actions among competing firms (mostly oligopolistic firms) in an industry designed to control the market, raise the price, and otherwise act like a monopoly. Also termed tacit collusion, the distinguishing feature of implicit collusion is the lack of any explicit agreement. This is one of two types of collusion. The other is explicit or overt collusion, which involves an explicit agreement.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius trying to buy either several magazines on fashion design or a package of 3 by 5 index cards, the ones without lines. Be on the lookout for small children selling products door-to-door.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
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