Carry trades are speculative activities which involve simultaneously going short a low-rate currency and long a high-rate currency. They are profitable as long as the gains from interest rate differentials are not offset by exchange rate movements. In this paper I investigate the dynamic relationships amongst exchange rate changes, interest rate spreads and carry trades by means of a Markov-switching vector autoregression model. I use regime-dependent impulse response functions to assess (1) how and to what extent shocks to the interest rate differential and the bilateral exchange rate affect the yen carry trade; (2) the consequences of the unwinding of the yen carry trade on the dollar-yen exchange rate. Empirical evidence indicates the presence of a so-called carry trade regime, whose timing is consistent with the yen carry trade episodes identified in the literature. Moreover, only when the system is in the carry trade regime a shock in the carry-to-risk ratio has a positive and significant effect on the net short positions in Japanese yen and the depreciation of the yen against the dollar is strong and persistent. Finally, a rising carry-to-risk ratio, which in turn reveals an increase in the attractiveness of carry trades, leads to a significant depreciation of the yen only when the system is in the carry-trade regime.

Yen carry trades have traditionally been viewed in narrow terms purely as a foreign exchange transaction. However, evidence from the waxing and waning of balance sheets of foreign banks operating in Japan points to a broader notion of the carry trade. Yen liabilities fund not only pure currency carry trades, but also fund the general increase in balance sheets of hedge funds and financial intermediaries. The difference in overnight rates across countries is a crucial determinant of balance sheet changes. Domestic monetary policy thus has a global dimension.--Author's description.

With the removal of the benign conditions that underlie the profitability of this trading strategy, the future of the 'yen carry trade' and the continued weakness of the yen have come into question by market participants. [...] Table 1 reports the correlation between the interest rate differential (defined as the difference between the foreign interest rate and the Japanese interest rate) and the percentage rate depreciation of the yen, and confirms that the correlation has increased since 2002 for all four currency pairs considered.11. [...] While the yen's share of reserves has declined, the share allocated to the euro has increased over the same period, from 17.5 per cent in 2000 to 25.6 per cent in 2007Q2, and the share allocated to the pound has also moved ahead of the yen. [...] Further background on the forward premium puzzle and evidence that UIP fails in Japan is provided in Appendix A. Given that interest rates have been low in Japan relative to other countries since the early 1990s, another contributing factor to the profitability of carry trades, in addition to the failure of UIP, is the role of declining transactions costs and low volatility. [...] On 17 June 1998, the U. S. Treasury and the Japan Ministry of Finance agreed to a joint intervention in the foreign exchange market, to strengthen the yen to better reflect fundamentals; however, even after this intervention the yen continued to depreciate.

"This paper examines the available data that may shed light on the carry trade in Japanese yen. We define an individual or a sector to be engaged in the carry trade if it has a short position in yen and a long position in other currencies. The tendency of large yen movements to be skewed toward appreciations is consistent with the existence of substantial carry positions, and other evidence from market prices provides some modest support for an effect from the carry trade. Data on bank loans and bond holdings by currency reveal a large apparent yen carry position of the Japanese official sector and modest carry positions in the Japanese and foreign banking sectors. The Japanese private non-banking sector has a large long foreign-currency position, but does not have a short yen position, and is thus not engaged in the yen carry trade in the aggregate. However, it is possible that exporters and investors in Japan use the derivatives markets to hedge some of their long foreign-currency exposure, with the private non-banking sector outside of Japan (including most hedge funds) likely to be taking on most of the associated carry exposure"--Federal Reserve Board web site.

Dollar and Yen analyzes the friction between the United States and Japan from the viewpoint of exchange rate economics. From the mid-1950s to the early 1990s, Japan grew faster than any other major industrial economy, displacing the United States in dominance of worldwide manufacturing markets. In the 1970s and 1980s, many books appeared linking the apparent decline of the United States in the world economy to unfair Japanese practices that closed the Japanese market to a wide range of foreign goods. Dollar and Yen analyzes the friction between the United States and Japan from the viewpoint of exchange rate economics. The authors argue against the prevailing view that the trade imbalance should be corrected by dollar depreciation, saying that adjustment through the exchange rate is both ineffective and costly. Stepping outside the traditional dichotomy between international trade and international finance, they link the yen's tremendous appreciation from 1971 to mid-1995 to mercantile pressure from the United States arising from trade tensions between the two countries. Although sometimes resisted by the Bank of Japan, this yen appreciation nevertheless forced unwanted deflation on the Japanese economy after 1985--resulting in two major recessions (endaka fukyos). The authors argue for relaxing commercial tensions between the two countries, and for limiting future economic downturns, by combining a commercial compact for mutual trade liberalization with a monetary accord for stabilizing the yen-dollar exchange rate.