Japan Needs Higher Interest Rates

In the wake of the October 2026 OECD report on purchasing‑power‑parity (PPP) equilibrium, the persistent misalignment between the yen and the U.S. dollar has resurfaced as a central concern for Japanese macro‑policy. The PPP estimate of roughly 93 yen per dollar stands in stark contrast to the market rate that has hovered in the 150–160 yen per dollar band throughout 2026. This divergence, first highlighted in the recent field observations of a visiting American couple in Sapporo, underscores a dual‑edged dilemma: exporters reap the benefits of a competitively weak currency, while import‑dependent sectors and households confront heightened price pressures. The following analysis situates this contemporary episode within the longer arc of Japan’s exchange‑rate history, evaluates the recent monetary‑policy shift by the Bank of Japan (BOJ), and outlines the strategic choices confronting Japanese policymakers as they navigate a global environment of rising U.S. interest rates.

Historical Context: From Plaza Accord to Deflationary Stagnation

The 1985 Plaza Accord marked a watershed moment for Japan’s external equilibrium. By coordinating an appreciation of the yen against the dollar, the accord inverted the earlier pattern of a weak yen that had underpinned Japan’s export‑led growth in the early 1980s. In the decades that followed, the yen’s real strength intensified, pushing the PPP exchange rate above the market rate and peaking at nearly double the equilibrium level by 1995. This overvaluation contributed to chronic deflation, a contraction in export competitiveness, and a prolonged period of stagnant growth that defined the “lost decades.”

These dynamics were compounded by the global financial shock of 2008, when the United States adopted aggressive monetary easing. The resulting widening of the U.S.–Japan interest‑rate differential reinforced the yen’s weakness, yet the BOJ’s response—characterized by a reluctance to loosen policy in line with shifting conditions—exacerbated deflationary pressures. The historical trajectory from Plaza‑induced overvaluation to post‑2008 under‑adjustment provides a crucial backdrop for understanding today’s policy dilemma.

Monetary Policy Evolution: From Abenomics to the Current Tightening Cycle

When Shinzo Abe returned to power in 2012, his “Abenomics” reform package introduced a bold monetary‑expansion component, championed by then‑BOJ Governor Haruhiko Kuroda. This shift aimed to combat entrenched deflation by expanding the money supply and lowering real interest rates. The policy succeeded in moderating price declines but did not fully restore inflation to the BOJ’s 2 percent target, leaving the economy vulnerable to external shocks.

In the post‑COVID era, the United States experienced a surge in inflation, prompting the Federal Reserve to abandon its accommodative stance and raise short‑term rates to near 4 percent. The resulting appreciation of the dollar intensified the yen’s depreciation, reversing the deflationary bias and ushering in nascent inflationary pressures within Japan. In response, the BOJ lifted its policy rate to 1.25 percent in September 2026—the highest level in 31 years—signalling a tentative pivot toward monetary tightening.

Current Exchange‑Rate Misalignment and Its Economic Implications

The OECD’s PPP estimate of 93 yen per dollar implies that a representative basket of goods would cost roughly one‑third less in Japan than in the United States if the market rate aligned with the equilibrium. The actual rate of 150–160 yen per dollar therefore renders Japanese exports relatively cheap, bolstering demand and profit margins for export‑oriented firms. Conversely, importers face a steep cost increase, eroding margins and prompting price pass‑through to consumers.

For Japanese households, the weak yen translates into higher prices for imported food, energy, and consumer goods, creating upward pressure on the overall price level. The BOJ’s modest rate hike to 1.25 percent, while historically significant, remains insufficient to close the interest‑rate gap with the United States, where rates hover near 4 percent. This gap sustains the incentive for “carry‑trade” arbitrage—borrowing cheaply in yen to invest in higher‑yielding foreign assets—thereby exerting additional upward pressure on the yen’s depreciation.

Policy Coordination: Fiscal and Monetary Dialogues

Recent communications between U.S. Treasury Secretary Scott Bessent and Japanese Finance Minister Katayama Satsuki illustrate an emerging dialogue on fiscal and monetary coordination. While the BOJ retains formal autonomy, the interplay between fiscal policy—managed by the Ministry of Finance (MOF)—and monetary policy under Governor Kazuo Ueda is increasingly salient. The BOJ’s mandate to ensure price stability must be balanced against the fiscal government's objectives of growth and social welfare, especially as imported inflation threatens household budgets.

Given the BOJ’s limited toolkit in a low‑interest‑rate environment, a more aggressive rate hike could be complemented by fiscal measures aimed at easing the burden on import‑dependent sectors. Such coordination would align with the broader strategic framework advocated by think‑tanks such as the Asan Institute for Policy Studies, which emphasize the importance of synchronized macro‑policy in addressing external imbalances.

Potential Trajectories for BOJ Policy

Three plausible pathways emerge for the BOJ in the coming year. First, a gradual acceleration of rate hikes—raising the policy rate incrementally toward the mid‑single digits—could narrow the interest‑rate differential, dampen carry‑trade flows, and support yen appreciation. Second, a more cautious approach that maintains rates near 1.25 percent while deploying targeted liquidity measures could mitigate the risk of choking domestic demand, particularly in sectors still adjusting to higher import costs. Third, a reversal to accommodative policy would risk re‑igniting deflationary expectations and could destabilize the fragile balance achieved since the 2026 rate increase.

Each trajectory carries trade‑offs. A rapid tightening may provoke a sharp yen appreciation, potentially harming export competitiveness and reigniting the deflationary spiral of the 1990s. Conversely, insufficient tightening could allow the yen to remain undervalued, perpetuating import‑price inflation and eroding household purchasing power. The BOJ’s decision will therefore hinge on its assessment of the inflation outlook, the durability of export demand, and the resilience of the domestic financial system.

Regional Implications: Northeast Asian Economic Stability

Japan’s exchange‑rate and monetary‑policy choices reverberate across Northeast Asia. A stronger yen would improve Japan’s terms of trade with neighboring economies, particularly South Korea and China, by reducing the cost of Japanese inputs used in regional supply chains. However, a weaker yen—if left unchecked—could exacerbate competitive imbalances, prompting protective measures or currency interventions by regional partners.

Institutions such as the Korea Development Institute (KDI) and the Korea Institute for International Economic Policy (KIEP) have highlighted the sensitivity of regional trade flows to exchange‑rate volatility. Japan’s policy stance, therefore, not only affects domestic macro‑stability but also contributes to the broader equilibrium of the East Asian economic bloc, influencing trade negotiations, investment flows, and diplomatic engagements.

Forward‑Looking Assessment: Balancing Stability and Growth

In sum, the 2026 PPP divergence underscores a structural tension between Japan’s export advantage and the inflationary pressures confronting its import‑dependent sectors. The BOJ’s modest rate hike to 1.25 percent marks a historic shift, yet the policy remains modest relative to the U.S. benchmark of near 4 percent. To achieve a sustainable equilibrium, Japanese policymakers must calibrate monetary tightening with fiscal support, while remaining vigilant to the carry‑trade dynamics that amplify exchange‑rate volatility.

Looking ahead, a coordinated approach—anchored in the analytical frameworks of the Ministry of Economy and Finance (MOEF), informed by the research of the Asan Institute, and attuned to regional interdependencies—will be essential. By aligning monetary policy with broader economic objectives, Japan can navigate the current misalignment, safeguard household welfare, and preserve its competitive edge in the evolving landscape of Northeast Asian geopolitics.

This article was produced with AI-assisted research and editorial support. Reporting is based on the source material cited below. Sources: The Diplomat; thediplomat.com; Global1.News (25 October 2026).

By Prof. David Park, Staff Writer