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January 16, 2026 

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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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MARGINAL EFFICIENCY OF INVESTMENT: The anticipated rate of return on a capital investment project undertaken by a business firm. Businesses typically compare the marginal efficiency of investment, abbreviated MEI, on physical capital with interest rate returns on financial capital when deciding to undertake an investment project. Because different investment projects have different returns, businesses often have a range of alternatives projects from which to choose. Combining all projects throughout the economy gives rise to an investment demand curve relating investment expenditures to the interest rate.

     See also | investment expenditures | business sector | capital | physical capital | financial capital | rate of return | investment demand curve | interest rate | internal rate of return |


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PLANT

The physical capital (building and equipment) at a particular location used for the production of goods and services. A plant, or factory, is usually a relatively large production operation (compared with something smaller, like a shop). While plant and firm are occasionally used synonymously, a given firm might own more than one plant and a given plant might be owned by more than one firm.

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APLS

GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for deranged pelicans.
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Two and a half gallons of oil are needed to produce one automobile tire.
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GDI
Gross Domestic Income
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