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KEYNESIAN MODEL: A macroeconomic model based on the principles of Keynesian economics that is used to identify the equilibrium level of, and analyze disruptions to, aggregate production and income. This model identifies equilibrium aggregate production and income as the intersection of the aggregate expenditures line and the 45-degree line. The Keynesian model comes in three basic variations designated by the number of macroeconomic sectors included--two-sector, three-sector, and four sector. The Keynesian model is also commonly presented in the form of injections and leakages in addition to the standard aggregate expenditures format. This model is used to analyze several important topics and issues, including multipliers, business cycles, fiscal policy, and monetary policy.

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PROFIT

Generally speaking, the difference between revenue received by a firm for production and cost incurred in the production, or the excess of revenue over cost. Three specific notions of profit exist, each with a different meaning. Accounting profit is the difference between revenue and accounting cost. Economic profit is the difference between revenue and total opportunity cost. Normal profit is opportunity cost of entrepreneurship. Profit is occasionally used synonymously with the term rent, or economic rent.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either a brown leather attache case or car battery jumper cables. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"The greatest barrier to success is the fear of failure."

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LRMC
Long Run Marginal Cost
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