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July 18, 2025 

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GDP: The total market value of all goods and services produced within the political boundaries of an economy during a given period of time, usually one year. This is the government's official measure of how much output our economy produces. It's tabulated and reported by the National Income and Product Accounts maintained by the Bureau of Economic Analysis, which is part of the U. S. Department of Commerce. Gross domestic product is one of several measures reported regularly (every three months) by the pointy-headed folks at the Bureau of Economic Analysis.

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PRICE-COST MARGIN: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The price-cost margin is usually taken as an indicator of market power because the larger the margin, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The price-cost margin depends on the elasticity of demand. The price-cost margin is also called the Lerner index of market power.

     See also | market power | monopoly | price | competitive market | price maker | price leadership | marginal-cost pricing | Lerner index |


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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either a genuine fake plastic Tiffany lamp or a microwave over that won't burn your popcorn. Be on the lookout for small children selling products door-to-door.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
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