Pareto efficiency is a point where nobody can be made better off without worsening someone. And Pareto improvement is a point where at least one is better off without worsening the other. A set of Pareto efficient points in Edgeworth is known as a contract curve. Thus a movement from one efficient point to another is the change but not a Pareto improvement
Pareto efficiency is said to occur when it is impossible to make one party better off without making someone worse off. A Pareto improvement is said to occur when at least one individual becomes better off without anyone becoming worse off.
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