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MARKET STRUCTURE: The manner in which a market is organized, based largely on the number of firms in the industry. The four basic market structure models are: perfect competition, monopoly, monopolistic competition, and oligopoly. The primary difference between each is the number of firms on the supply side of a market. Both perfect competition and monopolistic competition have a large number of relatively small firms selling output. Oligopoly has a small number of relatively large firms. And monopoly has a single firm.

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45-DEGREE LINE: A guideline used in Keynesian economics in conjunction with the consumption line (to derive saving) and the aggregate expenditures line (to identify Keynesian equilibrium). This guideline forms a 45-degree angle with both the horizontal income axis and the vertical consumption expenditure (or aggregate expenditures) axis in the Keynesian graphical analysis. Each point on the line represents equality between income and horizontal axis and consumption expenditure (or aggregate expenditures) on the vertical axis.

     See also | Keynesian economics | consumption line | Keynesian equilibrium | income | consumption | aggregate expenditures | saving | consumption-income relation |


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MARGINAL ANALYSIS

A basic technique used in economics that analyzes small, incremental changes in key variables. Marginal analysis is the primary analytical approached used in the study of markets, production, consumption, business cycles, and economic policies. It not only reflects how most economic decisions are made, it also lends itself to mathematical and graphical analysis.

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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 box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for broken fingernail clippers.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"Plans are only good intentions unless they immediately degenerate into hard work."

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