To explain this, the so called Dollar Smile Hypothesis advanced by Stephen Jen, Morgan Stanley's currency strategist, is useful. This held that the dollar had a “convex” relationship to US economic growth.
美元在微笑。美元貿易加權指數今年的曲線圖看起來像是在微笑——下挫7%,然后是一條長長的持平曲線,隨后在過去數周上漲10%,向上翹起形成一張咧開的大嘴。如今,美元匯率已較去年底有所上升。
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