如果一种可行经济状态已经不存在帕累托改进，那么就说这种经济状态是帕累托有效的(Pareto efficient)，或者说是经济有效的(economically efficient)。
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虽然这是有目共睹的今天每个瓦尔拉斯均衡是帕累托有效的，这是不知道到更复杂的证明在1936年制定了亚伯拉罕沃尔德和约翰冯诺依曼在1938年。
While it is known today that every Walras equilibrium is Pareto efficient, this was not known until more complex proofs were devised in 1936 by Abraham Waldand John von Neumannin 1938.
帕累托有效是指没有哪个人的境况可以在所有其他人的境况都不变差的情况下有所改善。
Pareto efficiency means that no one can be made better off without someone becoming worse off.
“帕累托最优”要求一个有充分竞争的市场环境，所以，促进我国资金资源的配置效率就必须要打破垄断的局面，在银行业引入有效竞争机制。
Pareto Efficiency requires a free market , so what we can do is to break the state of monopoly and introduce effective competition to the market.
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