When Central Banks Stop Believing in Ceasefires

The Nikkei fell nearly 2% on July 13 as U.S. strikes hit Iran and Iranian missiles landed on five Gulf states. The next day it rose — not because anything was resolved, but because a U.S. inflation number came in cool ^[1]. This is the rhythm the market has learned across six months of Gulf escalation: a selloff on the shock, a rebound on the relief that something did not get worse. The KOSPI entered a bear market in July, down 25% from its June record, and still found days to rally ^[2]. Every crash has been followed by a bounce. The pattern has become so reliable that it has produced its own conviction: the Gulf conflict is a toll on growth, not a regime change — a cost markets can price, absorb, and trade through. A rate hike does not bounce. On July 14, the Bank of Korea raised its policy rate to 2.75%, the first increase in over three years ^[3]. The central bank was explicit about why.

Inflation is projected to remain elevated for some time as the impact of the rise in energy prices feeds through with a time lag. — Industrial Bank of Korea

It warned that the inflation would not pass quickly.

inflation is expected to remain above the target level for a considerable period — Industrial Bank of Korea

A central bank that raises rates because of a foreign war has stopped treating that war as temporary. The rate decision is a one-way door: a central bank does not un-raise rates the next session because oil fell five dollars. That asymmetry — the permanence of the monetary response against the transience of the market one — is where the signal lives. The clearest evidence that something changed is not the rate hike itself but the path one man took to get there. Bank of Korea Governor Shin Hyun-song spent the spring and summer of 2026 losing faith in diplomacy, and he did it in public. On May 28, Shin held rates steady. His statement was conditional — growth would hold, he said, but only under one assumption.

There is a need to raise interest rates at an appropriate time in the future. — Hyun-Song Shin

The condition was the whole sentence. The Bank of Korea was not forecasting a resolution; it was making its own policy contingent on one. By June 12, the condition had curdled into urgency. Shin called on the board to act.

Therefore, it is necessary to focus on price stability and raise interest rates without delay. — Hyun-Song Shin

The Middle East had moved from a risk factor in the outlook to the reason for a policy pivot. Then came June 17. The United States and Iran signed a ceasefire. Oil prices collapsed from $113 to under $70 a barrel ^[4]. For any central banker treating the conflict's inflation as transitory, this was the moment to stand down. Shin did not. On the very day the truce was signed, he warned that the inflation was not going anywhere.

Although geopolitical tensions have eased somewhat following the ceasefire agreement between the U.S. and Iran, upside risks to inflation remain. — Hyun-Song Shin

He went further, rejecting the logic that a diplomatic breakthrough would quickly unwind the energy shock.

It could take considerable time for energy supply chains to normalize and for oil prices to stabilize. — Hyun-Song Shin

This was the moment the governor separated himself from the market's thesis. The ceasefire was real, the oil-price drop was real, and he looked at both and said: the inflation is still coming. He was right. The ceasefire collapsed. On July 14, Shin raised rates ^[3]. The arc is not subtle. A governor who in May made his policy conditional on a Middle East resolution became, by June, a governor who did not believe a resolution would be enough — and by July, a governor who acted on that belief. The ceasefire gave him the cleanest possible test of his own conviction, and he passed it at the cost of looking pessimistic on the one day everyone else was exhaling. South Korea is not alone. The Bank of Japan raised its policy rate to 1% on June 9 — a 31-year high — and cited the same driver.

Taking into account that medium- and long-term inflation expectations have also continued to increase, there is a risk of underlying inflation deviating above our price target. — Bank of Japan

The BOJ noted that the pass-through from energy costs was moving faster than expected.

The price pass-through stemming from rising crude oil prices has been progressing at a relatively fast pace in business-to-business transactions, which could spread to an increase in consumer prices across a wide range of items. — Bank of Japan

The Reserve Bank of India warned in late June that a breakdown in the U.S.-Iran peace process could produce structurally lower growth — the word "structurally" doing the work that separates a central bank's assessment from an analyst's forecast. HSBC had argued the RBI would look through the inflation as temporary, and YES Bank predicted that falling oil prices after the June 17 ceasefire would let the RBI postpone any hike ^[5].

We are not forecasting a bigger rate hike than 50 bps for now because we believe the RBI will look through part of the inflation increase as temporary. — HSBC Global Investment Research

The RBI itself did not agree. Its warning of structural damage was a rejection of the transitory-inflation thesis that the analyst class was still retailing. Three central banks, three versions of the same conclusion. The Federal Reserve, by contrast, held rates at 3.5% to 3.75% through June — but only because the June 17 ceasefire briefly gave it room. The Fed's own Beige Book had identified energy-related costs tied to the conflict in the Middle East as the primary driver of inflationary pressures, with spillovers into shipping, packaging, groceries, and fertilizer ^[6]. U.S. PCE inflation hit 4.1% in May, the highest since April 2023 ^[7]. The Fed did not disagree with the diagnosis; it was simply the one major central bank that got a ceasefire in time for its decision. The distinction that organizes all of this is the difference between what a stock market prices and what a central bank prices. A stock market prices a toll — a known cost that diplomacy can lift, that a ceasefire can reverse, that a trader can buy on the dip. That is why the Nikkei can surge the day after a crash, why the KOSPI can find a rally inside a bear market. A toll is reversible by definition. A central bank, when it raises rates, is pricing something else: a regime. The rate hike says this inflation is not a cost to be absorbed until the strait reopens. It is a condition that has entered the domestic price structure — wages, import prices, expectations — and will persist whether or not the next ceasefire holds. A central bank does not un-raise rates on a relief rally. That is the asymmetry. The market can bounce. The rate decision cannot.