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February 13, 2026 

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NAFTA: An abbreviation for the North American Free Trade Agreement, which is an economic, international trade treaty between the three nations that occupy the North American continent -- Canada, Mexico, and the United States -- that was launch in 1994. The North American Free Trade Agreement is designed to eliminate assorted trade barriers between Canada, Mexico, and the United States, including the reduction or elimination of many tariffs and nontariff barriers. While economic theory clearly indicates efficiency is enhanced by the reduction and elimination trade restrictions, NAFTA has been strongly opposed by those potentially harmed by more efficient trade, especially labor unions. However, NAFTA is merely one of several international trade agreements created over the years to reduce trade restrictions. Others include the General Agreement on Tariffs and Trade and the Maastricht Treaty.

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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.

     See also | intersection | graph | economic analysis | indifference curve | budget line | monopolistic competition | demand curve | excess capacity |


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ABSTRACTION

Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is an essential feature of the scientific method. Hypothesis verification, model construction, and comparative static analysis are not possible without abstraction.

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