Original Sin Redux: Role of Duration Risk*

Abstract

We highlight the role of duration and exchange rate risks on portfolio flows by using a unique and comprehensive database of U.S. investor flows into emerging market government bonds denominated in local currency. Borrowing long-term mitigates rollover risk but amplifies valuation changes that further interact with currency movements. Our analysis highlights the double-edged nature of long-term borrowing and draws attention to market stress dynamics due to strategic complementarities among mutual fund investors.