For nearly three decades, Japan occupied a unique place in global finance. While the rest of the world worried about inflation, Japan worried about deflation. While other central banks raised rates, the Bank of Japan printed money. While investors searched for yield everywhere else, Japanese capital flowed abroad in search of returns. That era may finally be ending. The Bank of Japan has raised its policy rate to 1%, the highest level since 1995, while simultaneously signalling that the long process of monetary normalisation is far from complete. On the surface, the decision was widely expected. In reality, it may prove to be one of the most important developments for global markets this year. Japan is not simply raising interest rates. It is abandoning an entire economic model. The immediate catalyst is familiar. Inflation.

The Iran war, the energy shock and the persistent weakness of the yen have created a toxic combination for a country that imports most of its energy and raw materials. Oil prices may have retreated following the Hormuz agreement, but the inflationary effects are already embedded throughout the economy. Producer prices continue to rise, wage growth is accelerating, and inflation expectations are becoming increasingly entrenched. For the Bank of Japan, the danger is no longer inflation that is too low. It is inflation that becomes too high. This explains why policymakers are willing to continue tightening despite growing political pressure. Prime Minister Sanae Takaichi would clearly prefer a more accommodative monetary stance. Several recently appointed members of the policy board are viewed as more dovish. The government fears the consequences of higher borrowing costs on growth and public finances. The Bank of Japan appears increasingly unconvinced. The most revealing element of the decision was not the rate increase itself. It was the language accompanying it. For the first time in years, the Bank omitted references to maintaining exceptionally low borrowing costs. This may sound technical. It is not. Central banks choose every word carefully. The removal of this language suggests policymakers increasingly believe they are approaching a neutral rate environment where monetary policy is no longer supporting growth but simply maintaining stability.

That is a profound change. For global investors, the implications extend far beyond Japan. The world’s largest creditor nation is slowly changing direction. For years, Japanese investors recycled vast amounts of capital into US Treasuries, European bonds and global credit markets because domestic yields were virtually non-existent. As Japanese rates rise, that incentive begins to weaken. Money that once flowed abroad may increasingly find reasons to remain at home. This is one of the most underestimated risks facing global bond markets. The timing could hardly be worse. Governments are issuing debt at record levels. The United States continues to run massive fiscal deficits. Europe is financing defence spending, energy transitions and ageing populations. Sovereign borrowing is exploding almost everywhere simultaneously. And now one of the world’s largest sources of savings is becoming less willing to subsidise the rest of the planet.

The consequences could be significant. Higher Japanese yields may add further upward pressure on global bond yields, precisely when markets are already questioning fiscal sustainability across developed economies. The implications for the dollar are particularly important. For years, the carry trade represented one of the most reliable strategies in global markets. Investors borrowed cheaply in yen and invested in higher-yielding dollar assets. The widening interest-rate differential supported both Treasury demand and dollar strength. That mechanism is slowly beginning to reverse. A policy rate of 1% may still appear modest compared with the United States, but the direction of travel matters more than the level itself. If the Bank of Japan continues to tighten while US growth slows and fiscal concerns intensify, part of the structural support that has underpinned the dollar for years may gradually erode. This does not imply an immediate collapse of the dollar. It does suggest that one of its most powerful long-term allies is becoming less dependable.

For decades, investors worried that Japan represented the future: low growth, low inflation, ageing demographics and permanently low interest rates. Today, Japan may be one of the first major economies recognising that the world has changed. Inflation has returned. Energy security matters again. Geopolitics has become an economic variable. And central banks can no longer pretend otherwise. The Bank of Japan has joined the global tightening cycle. That may prove far more important than the quarter-point increase itself. Because when the last central bank finally abandons emergency monetary policy, it is often a sign that the emergency has become something permanent.