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在这里曾与一位网友谈到过人民币汇率的问题，因此转发这篇论文，供大家参考
The U.S. Current Account and the Dollar
OLIVIER J. BLANCHARD， Massachusetts Institute of Technology
FRANCESCO GIAVAZZI ，University of Bocconi - IGIER
FILIPA SA，MIT
January 26, 2005
Abstract: There are two main forces behind the large U.S. current account deficits. First, an increase in the U.S. demand for foreign goods. Second, an increase in the foreign demand for U.S. assets.
Both forces have contributed to steadily increasing current account deficits since the mid-1990s. This increase has been accompanied by a real dollar appreciation until late 2001, and a real depreciation since. The depreciation has accelerated recently, raising the questions of whether and how much more is to come, and if so, against which currencies, the euro, the yen, or the renminbi.
Our purpose in this paper is to explore these issues. Our theoretical contribution is to develop a simple portfolio model of exchange rate and current account determination, and to use it to interpret the past and explore alternative scenarios for the future. Our practical conclusions are that substantially more depreciation is to come, surely against the yen and the renminbi, and probably against the euro. Keywords: current account deficit, dollar, depreciation, appreciation, euro, portfolio choice, yen, renminbi JEL Classifications: E3, F21, F32, F41
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