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July 5, 2025 

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HARROD-DOMAR MODEL: A model economic growth developed by R. F. Harrod and E. D. Domar that seeks to explain why an economy would not grow as fast has its potential growth rate. This model is based on the notion that actual income determines the amount saving, which is determines investment, which is what affects the rate of economic growth. If saving is not enough, the potential growth rate will not be achieved. The Harrod-Domar model, developed in the 1930s, has a strong Keynesian economic flavor, both indicating that the economy does not automatically achieve its potential.

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PARETO EFFICIENCY: A type of efficiency that results if one person can not be made better off without making someone else worse off. Named after Vilfredo Pareto, this criterion is the guiding theoretical notion of efficiency used in the study of economics, especially welfare economics. Pareto efficiency is generally not attained if some resources are idle or unemployed. By engaging idle resources in production, some people can have more production without reducing that available to others. A problem with Pareto efficiency, however, is that it is based on the existing distribution of income and wealth. This is one of two noted efficiency criteria used in economics. The other is Kaldor-Hicks efficiency.

     See also | efficiency | Pareto improvement | Kaldor-Hicks efficiency | welfare economics | externality | market failure | unemployment | resources | income distribution | wealth distribution | distribution standards |


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PRODUCT LIFE CYCLE

The different stages that a product traverses over the course of its life from initial availability (birth) to eventual unavailability (death). The key stages are development, introduction, growth, maturity, saturation, and decline. The product life cycle, represented by an S-shaped curve, is an adaptation of the biological life cycle and is common to the study of marketing. It is also important in the analysis of innovation and economic instability. In addition to biological growth, comparable S-shaped life cycles are found in short-run production of a firm, the growth of a person's income, the acquisition of knowledge, and the development of a civilization.

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Today, you are likely to spend a great deal of time watching the shopping channel trying to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for rusty deck screws.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
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