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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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EFFICIENT

The state of resource allocation that exists when the highest level of consumer satisfaction is achieved from available resources. This state can be accomplished through markets when the price buyers are willing and able to pay for a good--based on the satisfaction obtained--is equal to the price sellers need to charge for a good--based on the opportunity cost of production.

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Today, you are likely to spend a great deal of time at a dollar discount store seeking to buy either a coffee cup commemorating the first day of winter or a video game player. Be on the lookout for attractive cable television service repair people.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
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