The role of the Japanese yen as an international currency is assessed. It is found that the determinants of international-currency use imply some increase for the yen’s use in international finance; however, the implications for the yen’s use in international trade are mixed. It is also shown that, despite Japan’s emergence as the world’s largest net creditor nation, Japan’s capital outflows have not significantly facilitated the yen’s internationalization. Data are presented showing that, although the yen’s use as an international currency has increased, it is still rather modest. Wider use of the yen as a regional currency in Asia has occurred, though a “yen-zone” does not appear to be emerging.

The yen is an important barometer for the Japanese economy. Depreciations are typically associated with favorable economic developments such as increased corporate profits, rising equity prices, and upward pressure on domestic consumer prices. On the other hand, large and sharp appreciations run the risk of lowering actual and expected inflation, squeezing corporate profits, generating a negative wealth effect through depressed equity prices, and reducing confidence in the Bank of Japan’s efforts to reflate the domestic economy and achieve the inflation target. This paper takes a closer look at underlying drivers of rapid yen appreciations, highlighting the key role of carry-trade and the zero lower bound as important amplifiers.