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February 12, 2026 

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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.

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SEVEN RULES: Seven key economic principles underlying the study of economics and the operation of the economy. These seven rules are: first -- scarcity, second -- subjectivity, third -- inequality, fourth -- competition, fifth -- imperfection, sixth -- ignorance, and seventh -- complexity.

     See also | first rule of scarcity | second rule of subjectivity | third rule of inequality | fourth rule of competition | fifth rule of imperfection | sixth rule of ignorance | seventh rule of complexity |


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EXCHANGE RATE

The price of the currency of one country stated in terms of the currency of another country, that is, the rate of exchange of one currency for another. Exchange rates, also termed foreign exchange rates, are prices determined in foreign exchange markets that are set up to trade the currencies of different nations (foreign exchange). In general, exchange rates reflect the overall health, vitality, and productivity of a nation's economy. However, because exchange rates also affect international trade (exports and imports) among nations they are often subject to governmental policy control.

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