孟德尔和马库斯·弗莱明在国际货币基金组织共同开发了另一个对促成货币联盟形成同样重要的概念——“不可能的三位一体”，这一观点进入了经济学教科书。

Equally important to the decision to join a monetary union was another of Mundell’s insights, developed with Marcus Fleming at the International Monetary Fund, which entered the economics textbooks.

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