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The condition in which the economy is producing what people want at least possible cost pareto efficiency; pareto optimality A condition in which no change is possible that will make some members of society better off w/o making some other members of society worse off. pareto efficient change makes at least one party better off and no party worse off.
Numerical stability is an important notion in numerical analysis. An algorithm is called numerically stable if an error, whatever its cause, does not grow to be much larger during the calculation. This happens if the problem is well-conditioned, meaning that the solution changes by only a small amount if the problem data are changed by a small amount.