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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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CONSTANT RETURNS TO SCALE

A given proportional change in all resources in the long run results in the same proportional change in production. Constant returns to scale exists if a firm increases ALL resources--labor, capital, and other inputs--by 10 percent, and output also increases by 10 percent. This is one of three returns to scale. The other two are increasing returns to scale and decreasing returns to scale.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius trying to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for the happiest person in the room.
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In the early 1900s around 300 automobile companies operated in the United States.
"I love the man who can smile in trouble, who can gather strength from distress and grow brave by reflection. "

-- Thomas Paine, statesman

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