The Yen's Five-Week Swing: From 161 to 141 Against the Dollar
The Japanese yen weakened to over 161 per US dollar on July 1, 2024, its weakest level against the greenback since 1986, according to Citigroup's CIO Bulletin.
The move then reversed sharply. Citigroup's later yen note, dated August 5, 2024, says the yen strengthened against the dollar after July 11 to a low of 141.70, from a high of 161.85. That is a 12.5% decline in the dollar's value measured from the high, the convention the note uses. Citigroup's Asia Pacific strategy note provides the later figures.
Two conventions matter here, because the same move reads differently depending on the base you use, meaning the starting value a percentage is measured from. A 12.5% fall from 161.85 to 141.70 measures the dollar's yen price going down. Measured the other way, as the yen's gain against the dollar (the number of dollars needed to buy one yen), the move works out to roughly 14%. Readers comparing this episode with other currency series should check which base a dataset uses before lining up percentages.
For ordinary savers and borrowers, the yen's level matters mainly through prices. A weaker yen makes dollar-priced imports more expensive for Japanese buyers, and it can lift the yen value of dollar earnings for Japanese exporters. A yen that moves 20 yen in a matter of weeks changes those calculations quickly. Households holding dollar assets or dollar-linked debt, measured in yen, saw their positions swing by a similar order of magnitude over the same window.
In my view, the 1986 reference point deserves careful reading. The yen had not been weaker than 161 per dollar in nearly four decades before July 2024, so the July 1 level sat outside the post-1986 range. That is a statement about the historical series, not a forecast of where the currency goes next.
The broader context here is a currency that spent much of 2024 near the weak end of its range before a fast retracement. Traders and corporate treasurers read speed of that kind as a signal about positioning, since a move this size in a major currency pair can leave leveraged positions (bets made with borrowed money) exposed to rapid unwinding. Any single cause offered in the market commentary of the period should be treated as interpretation rather than fact.
In my view, the useful lesson for investors is the width of the range. A 20-yen swing in roughly five weeks is large for a G10 currency, the group of major advanced-economy currencies. It shows how quickly a dollar-yen exposure can change sign in value terms for a portfolio that is not hedged, meaning one that is not protected against currency moves. Anyone modelling Japanese assets in dollar terms, or Japanese earnings translated back into yen, should carry the 161.85 high and the 141.70 low as the reference band for that period.
