In the spring of 2024, the Japanese yen fell past 160 to the dollar for the first time in many years. For most countries, a move like that would trigger emergency cabinet meetings, frantic calls to the International Monetary Fund, and the kind of market panic that ends political careers. In Japan, the reaction was more measured. Officials intervened selectively, issued carefully worded warnings, and then largely allowed the situation to persist. The currency did not bounce back to where it had been. It was not supposed to.
Currency weakness is one of the most misread signals in global finance. To a casual observer, a falling exchange rate looks like a symptom of distress, the financial equivalent of a fever. But for a significant number of governments over the past century, a weak currency has been a deliberate instrument of economic management, chosen with clear objectives and defended with sophisticated arguments. Japan’s experience over the past decade offers the most vivid recent example of this logic, but it is far from unique.
What a Weak Currency Actually Does
To understand why a government might want its currency to lose value, it helps to think through the basic mechanics. When a currency depreciates, exports become cheaper for foreign buyers. A Japanese automaker that sells a vehicle priced in yen receives the same number of yen but more dollars when those dollars are converted. That widens profit margins and makes Japanese goods more competitive on world markets against rivals from countries with stronger currencies.
At the same time, imports become more expensive. Foreign energy, food, and manufactured components cost more in domestic currency terms. This cuts both ways. For a resource-poor, import-heavy economy like Japan’s, higher import costs raise business expenses and squeeze household purchasing power. But for an economy that has spent decades fighting deflation, meaning persistently falling prices that discourage spending and investment, a dose of imported inflation can actually be welcome medicine. When prices never rise, consumers tend to delay purchases in anticipation of lower prices tomorrow. That behavior suppresses demand and keeps growth sluggish. Moderate inflation breaks that cycle.
Japan entered a long deflationary period after its asset bubble collapsed in the early 1990s, and it spent the following decades trying various tools to escape it. Currency depreciation, by raising the price of imported goods and boosting corporate profits that could be passed on as wages, became one lever in that effort.
The Architecture of Abenomics
The most explicit embrace of this strategy came after Shinzo Abe’s return to power in late 2012. The economic program that became known as Abenomics rested on three pillars, one of which was aggressive monetary easing by the Bank of Japan. Under Governor Haruhiko Kuroda, who took office in 2013, the Bank of Japan launched a program of quantitative and qualitative easing on a scale unusual even by post-financial-crisis standards. The central bank purchased Japanese government bonds and other assets at a pace designed to flood the financial system with liquidity and push long-term interest rates toward zero and below.
The direct consequence for the yen was predictable. When Japanese interest rates fall toward or below those of other major economies, investors have less incentive to hold yen-denominated assets. Capital flows toward higher-yielding currencies, and the yen weakens. Between 2012 and 2015, the yen fell from roughly 80 per dollar to around 125 per dollar. Japanese equities surged during the same period, in part because a weaker yen raised the yen-denominated earnings of the many large Japanese companies that do substantial business abroad.
This was not a side effect that policymakers tried to manage away. It was central to the design. The logic was that a weaker yen would raise corporate profits, those profits would eventually translate into higher wages, higher wages would lift domestic consumption, and consumption would finally push Japan out of deflation. The transmission was slower and more incomplete than proponents hoped, but the directional intention was clear and openly discussed.
The Bank of Japan also introduced a policy known as yield curve control in 2016, which set explicit targets for both short-term and long-term interest rates. By holding long rates near zero even as inflation and rates rose elsewhere in the world after 2021, the Bank of Japan effectively committed to keeping Japanese rates far below those of the United States and Europe. The interest rate differential that resulted was a powerful force pushing the yen lower. By mid-2024, the gap between Japanese short-term rates and U.S. federal funds rates was among the widest it had been between the two countries in many years.
When a Weak Currency Becomes Inconvenient
None of this means the strategy is without costs, and Japanese policymakers have never pretended otherwise. The yen’s slide to multi-decade lows by 2024 created genuine hardship for Japanese households. Import prices for energy and food, both of which Japan depends heavily on from abroad, rose sharply. Real wages, meaning wages adjusted for inflation, fell for an extended period. Consumer confidence weakened. The political optics of presiding over a currency that made everyday purchases more expensive put pressure on successive governments.
Japan’s Ministry of Finance intervened in foreign exchange markets multiple times in 2022 and again in 2024, spending tens of billions of dollars from its foreign reserves to slow the yen’s decline. These interventions were notable precisely because they were not attempts to reverse the weak yen policy but to manage its pace. The goal was to prevent what officials described as excessive volatility or one-sided moves, language that drew a distinction between an orderly weak yen and a disorderly collapse. The line between the two is genuinely difficult to define, but the conceptual distinction matters: a currency that weakens gradually can be absorbed by businesses and households, while a sharp and sudden drop can trigger capital flight and financial instability.
There is also the question of diplomatic friction. Currency policy does not happen in a vacuum. When one country’s currency weakens substantially, its export competitiveness improves at the direct expense of trading partners. South Korean manufacturers compete directly with Japanese firms in electronics and automobiles, and a weaker yen puts Korean exporters at a disadvantage. The United States has periodically placed Japan on currency monitoring lists maintained by the Treasury Department, which tracks countries whose trade surpluses and intervention activity raise questions about whether exchange rates are being manipulated for competitive advantage. Japan has consistently argued that its monetary policy serves domestic economic objectives rather than competitive currency targeting, a distinction that matters legally under international agreements but is harder to sustain as a practical matter when the effects are the same.
The Broader Logic: Japan Is Not Alone
Japan’s case is the most discussed, but the underlying logic, that a weaker currency can serve as a tool of economic policy, has appeared in many contexts. China’s management of the renminbi attracted sustained international criticism for years, with trading partners arguing that the currency was kept artificially undervalued to support exports. Chinese authorities maintained capital controls and actively managed the exchange rate rather than allowing it to float freely, and the debate over whether this constituted manipulation or prudent management generated years of trade tensions.
Switzerland offers a different example. The Swiss National Bank intervened repeatedly to weaken the franc during periods when investors rushed into it as a safe haven, particularly during the European debt crisis in the early 2010s. The Swiss central bank argued that an excessively strong franc threatened deflation and damaged the export-oriented parts of the Swiss economy. In 2015 it abandoned its official cap on the franc’s value against the euro, causing a dramatic one-day appreciation that rattled currency markets globally.
Even the United States, whose dollar is the world’s primary reserve currency and which benefits from that status, has not been indifferent to exchange rate levels. Episodes in American economic history suggest that a weaker dollar has sometimes been welcomed when policymakers wanted to boost exports or reduce trade deficits. The Plaza Accord of 1985, in which major economies coordinated to depreciate the dollar against the yen and the German mark, is a canonical example of deliberate currency weakening by agreement among the world’s largest economies.
What these cases share is a recognition among policymakers that exchange rates have real economic consequences and that influencing them, whether through interest rate policy, direct intervention, or international coordination, is a legitimate tool of economic management. The disagreements are not really about whether this is done but about the circumstances that justify it and the obligations countries have to their trading partners when they do it.
The Line Between Policy Tool and Beggar-Thy-Neighbor
The most serious critique of deliberate currency weakening is the competitive devaluation argument. If one country weakens its currency to boost exports, it effectively transfers demand from its trading partners to itself. If others retaliate by weakening their own currencies, the result can be a race to the bottom that destabilizes the global trading system without producing lasting gains for anyone. This fear was a major driver of the international monetary architecture built after World War II, including the rules embedded in the Articles of Agreement of the International Monetary Fund, which ask member countries to avoid manipulating exchange rates to gain unfair competitive advantage.
The difficulty is that the line between monetary policy conducted for domestic reasons and currency manipulation conducted for competitive reasons is often impossible to draw cleanly. When the Bank of Japan holds interest rates near zero to fight deflation, the yen weakens as a consequence. The primary stated purpose is domestic price stability, not export promotion, but the effect on trading partners is the same either way. Economists and international lawyers have argued about where to draw this line for decades without reaching a consensus.
One framework that has found some support distinguishes between expenditure-switching policies, which directly target the exchange rate, and expenditure-changing policies, which affect overall demand and have exchange rate consequences as a byproduct. Under this view, direct intervention to cap a currency’s value is more problematic than interest rate policy that weakens a currency as a side effect, even when the exchange rate outcomes look similar. Critics of this distinction argue that it is too easy to game, that a central bank with full awareness of the exchange rate consequences of its decisions cannot claim those consequences are unintended.
For Japan, the question has become more pointed as the yen’s weakness has persisted longer and gone further than many early proponents anticipated. By 2024, there were voices within Japan, including among some business groups and consumer advocates, arguing that the costs of the weak yen had begun to outweigh its benefits. The country’s trade balance had not improved in the way the original theory predicted, partly because energy imports priced in dollars became so much more expensive in yen terms that they offset gains on the export side.
Where This Leaves the Yen and the World
In March 2024, the Bank of Japan began moving away from its ultra-loose stance, ending its negative interest rate policy and its yield curve control, signaling a gradual normalization of monetary conditions. The yen did not stay on a recovery path, however. It weakened past 160 to the dollar again in 2026, and the Ministry of Finance intervened once more, spending ¥11.7 trillion in late April and early May of that year and a further ¥15.4 trillion between late July and late August.
But the broader lesson of the weak yen episode is not that the policy failed or that it succeeded in some clean way. It is that exchange rate management involves genuine tradeoffs, that governments approach those tradeoffs with specific domestic priorities in mind, and that what looks like a crisis from the outside can be a managed condition from the inside.
For investors, the implication is that exchange rate moves need to be read in context. A currency falling sharply is not always a market verdict on a country’s economic health. It may reflect a deliberate choice to prioritize some economic objectives over others, one that will be sustained precisely because it is serving its intended purpose, at least for the people making the decision. Understanding that distinction is the difference between reading a currency market correctly and consistently misinterpreting one of the most consequential signals in global finance.
The yen’s story is ultimately about how countries navigate the tensions between domestic needs and international obligations, between short-term economic management and long-term structural reform. Japan has not resolved those tensions, and it may not for some time. But it has demonstrated, more clearly than almost any other major economy in recent history, that a weak currency is sometimes exactly what a government is trying to achieve.