The Question Behind “Looking Through” an Energy Shock
Central-bank monetary policy after an energy shock is the subject here, and the question is when a central bank should look through a surge in energy prices rather than react to it immediately. The useful answer is not a rule about oil. It is a judgment about how long the shock may last, how far it may spread beyond energy, how much damage it may do to activity, and how those effects interact with the economy that receives them. This series builds the model needed to make that judgment without mistaking a dramatic headline for a complete policy signal.
A Price Shock Is Not Yet a Policy Instruction
The phrase “look through” can sound like a polite term for doing nothing. In monetary policy, it means something more specific: allowing a temporary movement in energy prices to pass through without trying to offset every first-round change in the overall price level. A central bank cannot make a conflict end, restore a disrupted supply route, or immediately produce more oil and gas. Raising interest rates to suppress the direct price increase could instead weaken demand and employment while the original supply problem is already reducing households’ purchasing power.
But looking through is not the same as declaring the shock harmless. The danger is that a narrow energy-price movement becomes a broader inflation process. Firms facing higher input costs may change prices beyond energy-intensive goods. Households may begin to expect further price increases and seek compensation. Workers may press for higher wages to protect real incomes. Fiscal measures may preserve spending power in ways that keep demand stronger. If these responses reinforce one another, the initial shock can leave a longer inflationary imprint after the commodity price itself has stopped rising.
That is the policy tension in its simplest form. The first-round increase may be outside the central bank’s control, while the second-round response is partly shaped by expectations, demand, and confidence in the central bank’s commitment to price stability. Waiting can avoid an unnecessary contraction if the shock is short-lived. Waiting can also be costly if inflation becomes harder to contain before monetary policy has time to work.
The recent energy shock makes this tension concrete. The BIS Bulletin on energy shocks and inflation reports that, during the five months after the onset of the war in Iran, global oil supply contracted by nearly 15%. Oil prices rose by more than 120% from their pre-war lows before moving back toward pre-conflict levels amid considerable volatility. The scale was among the most significant seen since the 1990s, although it was not unprecedented: oil prices rose by about 180% after Iraq’s 1990 invasion of Kuwait and peaked 77% higher after Russia’s 2022 invasion of Ukraine.
Those comparisons do not settle the policy question. In the earlier conflict episodes, prices retrenched as fighting ended or alternative sources of supply became available. At the start of the recent crisis, abundant reserves helped prevent an even larger increase. Yet the same episode also created reasons to worry about what might happen next. Gas prices in Asia doubled during the first month, and damage to infrastructure and difficulty securing alternative supplies raised the prospect of renewed volatility. The Strait of Hormuz was important not only for energy but also for fertilisers and helium, creating possible links to food production and semiconductor supply.
The figures are reported by the BIS and describe the event’s scale and uncertainty; they are not, by themselves, a forecast of inflation or a prescription for interest rates. Their importance is diagnostic. A central bank deciding whether to look through the shock must ask whether the observed reversal in one price is likely to last, whether supply disruption may broaden, and whether the economy has enough resilience to absorb another wave.
The Two-Sided Problem: Inflation and Activity
An energy shock matters to a central bank because it can push inflation and economic activity in opposite directions. Higher energy costs reduce the amount households can buy with a given income. They can raise firms’ costs and squeeze production. Financial conditions may worsen as markets reassess growth, profitability, and the risk of further disruption. At the same time, the direct price of energy rises, lifting measured inflation even when demand is not overheating.
This combination is different from a pure demand shock. A strong expansion in consumption or investment can raise both output and prices; in that situation, higher interest rates may cool demand while helping both sides of a central bank’s objectives. A supply-driven energy shock is more awkward. It can raise prices while lowering real income and weakening output. Tightening policy may reduce the risk that inflation spreads, but it can also deepen the loss of employment and production. Easing can protect activity, but it may support demand at the moment when the economy is already struggling with limited supply.
The Federal Reserve’s framework describes this through the output gap: the relationship between actual output, usually measured by gross domestic product, and potential output. When output is above potential, excess demand tends to put upward pressure on inflation and employment can run above its maximum sustainable level. When output is below potential, weak demand tends to accompany lower employment and downward pressure on inflation. The framework is not a perfect measuring instrument. Potential output is estimated, and an event can affect supply and demand at the same time. Its value is that it forces the policy discussion to include activity rather than treating inflation as the only relevant outcome.
The other essential dimension is time. Monetary policy works with a lag. If an energy shock is likely to reverse before a rate change has much effect, reacting aggressively to the initial price movement may produce a cost after the problem has already faded. A central bank could end up suppressing employment and demand in response to a price increase it could never have prevented and no longer needs to offset.
The opposite possibility is what makes the decision difficult. The duration of a conflict, the availability of alternative supplies, and the response of households and firms are uncertain while policymakers must act. A wait-and-see approach buys information. It allows the central bank to observe whether core inflation broadens, whether expectations move, and whether activity weakens. But it also gives second-round effects time to develop. If expectations begin to drift upward, bringing them back may require a stronger response than would have been needed earlier.
The question is therefore not simply whether oil prices will fall. It is whether the wider inflation process will reverse on its own before policy takes effect. An energy price can decline while firms continue adjusting prices, households continue revising expectations, or fiscal support continues to sustain demand. Conversely, a high energy price can coexist with contained underlying inflation if expectations remain anchored, demand is weak, and the price movement does not spread.
This is why the same initial event can create different decisions at different moments. Early information may point to a sharp but temporary supply disruption. Later information may reveal that the shock is lasting longer, that inventories are depleted, or that expectations are becoming less stable. The policy stance should be judged against the evolving balance of risks, not against a fixed label attached on the first day.
Four Questions Turn a Headline into a Judgment
A useful way to approach the problem is to turn the headline into four connected questions.
First, what kind of shock is it? A disruption to production and transport is initially a supply-side event, but the loss of real income can weaken demand. A separate boost to consumption or investment can add demand pressure. Trade-policy changes or other events can alter both productive capacity and spending. The categories help organize the evidence, but they should not be treated as mutually exclusive diagnoses known with certainty in real time.
Second, how persistent is it likely to be? The recent oil surge was shaped by conflict, reserves, infrastructure, and alternative supplies. A short disruption and a protracted closure of a major chokepoint have different implications even if their first-week price charts look similar. Persistence also has a behavioural side: if the public believes inflation will remain high, the shock may last in prices even after the physical supply constraint eases.
Third, how far will the shock pass through? The direct energy component is only the first stage. The central bank must watch core inflation, firms’ pricing, wage claims, household expectations, and the effects of subsidies or price caps. Evidence from the BIS indicates that large supply-driven energy increases have had disproportionately larger and longer-lasting effects on core inflation than smaller ones. It also finds that the inflation impact of an oil supply shock can be more than twice as large when expectations are above target as when they are well anchored. These are conditional empirical results, not universal thresholds, but they explain why the starting inflation environment matters.
Fourth, how much activity damage will the shock cause? Importers may suffer a terms-of-trade loss and exchange-rate depreciation, while exporters may gain income and see their currencies appreciate. Economies that use more energy in production or devote a larger share of household spending to it may experience stronger effects. Labour-market conditions, fiscal policy, and the initial monetary stance can amplify or dampen the consequences. A rate increase is easier to justify when activity remains resilient than when inflation is rising at the same time as employment is falling sharply.
These questions explain why there is no globally correct response to a common energy shock. The BIS reports that inflation expectations and anticipated policy paths differed across the United States, the euro area, and Japan during the 2026 episode. The differences are consistent with variation in energy dependence, subsidies, prior inflation experience, and other starting conditions, although market-implied policy paths show what investors expected rather than what a central bank should do.
The United States illustrates the point without resolving it. Vice Chair Philip N. Jefferson described the Middle East conflict as partly a supply shock that raised oil prices, reduced real incomes, and worsened financial conditions. He also noted that the United States is now a net oil exporter and that its production is less oil intensive than in the past, which should mute the demand effect. Yet inflation had already been above the Federal Reserve’s target, while unemployment was near a level many observers considered consistent with maximum employment. The result was still a conflict between price stability and employment, not a free pass to ignore the energy shock.
The durable lesson is modest but demanding. A central bank should not promise to offset every energy-price movement, because doing so can turn a temporary supply problem into an avoidable contraction. Nor should it assume that every price spike will disappear without consequences. Looking through is defensible only when the evidence supports a temporary first-round movement, contained pass-through, and manageable activity risks. When expectations, core inflation, or the duration of the disruption point toward persistence, earlier action may protect the credibility that gives policymakers room to respond to the next shock.
The policy judgment begins with the price event, but it ends with the economy’s response to that event. The next step is to make the initial diagnosis more precise: distinguish the supply and demand effects, locate the activity trade-off, and ask how much time the central bank has before its own response can matter.