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大衰退期间的美元:美国货币政策的信息渠道与“避险”

The Dollar during the Great Recession: The Information Channel of U.S. Monetary Policy and the “Flight to Safety”
The Journal of Finance · 2026 · Vania Stavrakeva、JENNY TANG

中文摘要

传统观点认为,相对于他国降低本国利率将导致本币贬值。我们发现,在商业周期频率上,大衰退期间美国前瞻指引式的货币政策放松产生了相反的效果。我们将这一效应归因于基于日历的前瞻指引传递了经济疲弱的信号,从而产生“避险”效应并降低了美国的预期通胀。我们还记录了跨货币的异质性:美国意外降息使美元对那些在世界经济收缩时通常贬值幅度更大的货币出现了更大幅度的升值。我们构建了一个能够调和这些发现的模型。

Abstract

ABSTRACT Conventional wisdom holds that lowering a home country's interest rate relative to another's will depreciate the domestic currency. We document that, at business‐cycle frequencies, U.S. forward guidance monetary policy easings had the opposite effect during the Great Recession. We attribute this effect to calendar‐based forward guidance that signaled economic weakness, resulting in a “flight‐to‐safety” effect and lower expected U.S. inflation. We also document cross‐currency heterogeneity: a surprise U.S. rate cut induced a larger appreciation of the dollar against currencies that typically depreciate more when the world economy is contracting. We build a model that can reconcile these findings.
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