The global economy is entering a new inflationary phase, not because one single shock has overwhelmed the system, but because three distinct forces are beginning to reinforce one another. Energy prices are rising again. Tariffs are becoming permanent. Artificial intelligence is generating one of the largest investment booms in modern history. Each of these developments would normally be analysed separately. Together, they form a new inflation triangle capable of reshaping monetary policy, bond markets and asset valuations for years. The most visible pressure is energy. Brent crude has moved above USD 100 per barrel as the conflict in the Middle East spreads from the Strait of Hormuz towards the Red Sea. The confrontation between the United States and Iran is no longer simply a military or diplomatic crisis. It is becoming a direct threat to global trade infrastructure. Shipping routes are being disrupted. Insurance costs are increasing. Transit times are lengthening. Energy security is once again becoming a central economic variable. This matters because energy shocks move rapidly through the system. The initial impact appears in oil and petrol prices. The second impact appears in transport, logistics and electricity costs. The third reaches food, manufacturing and services. The final stage is behavioural. Companies begin to assume that costs will remain elevated, workers seek compensation through higher wages and inflation expectations adjust. The longer the shock persists, the more difficult it becomes for central banks to treat it as temporary.

The world experienced a similar process after the pandemic. Policymakers initially assumed that higher prices reflected temporary bottlenecks that would disappear once supply chains normalised. That interpretation proved far too optimistic. Today, central banks cannot afford to make the same mistake. This explains the renewed pressure across global bond markets. The average yield on the Bloomberg Global Treasury Index has reached its highest level since the global financial crisis. British long-term yields have remained above 5%, German yields are trading at levels not seen since 2011, Japanese bond yields continue to rise, and the US 30-year Treasury remains close to its highest point since 2007. The scale of the adjustment reveals something fundamental. Markets are no longer pricing a short-lived interruption to disinflation. They are beginning to price a structural change in the inflation regime. For much of the past decade, investors believed that inflation would naturally return towards central-bank targets because globalisation, technology and demographics were fundamentally disinflationary. That assumption is now being challenged. Globalisation is fragmenting. Technology is becoming capital-intensive. Energy security requires duplication. Governments are running larger deficits. Defence expenditure is increasing. Supply chains are being reorganised around resilience rather than efficiency. Every one of these developments increases the cost structure of the global economy.

The second side of the inflation triangle is trade policy. The Trump administration has rebuilt its tariff system after the Supreme Court invalidated its previous framework. The United States will now impose duties of between 10% and 12.5% on imports from most major trading partners, with further measures under consideration against Europe, China, Canada, Brazil and other economies. The immediate macroeconomic impact may appear limited. The effective average US tariff rate has increased only modestly under the latest changes. But this misses the deeper transformation. Tariffs are no longer temporary negotiating tools. They are becoming the permanent architecture of American economic policy. Forced labour can justify tariffs. Industrial overcapacity can justify tariffs. Digital regulation can justify tariffs. Technology restrictions can justify tariffs. National security can justify tariffs. The economic consequence is cumulative. An individual tariff may be absorbed by an exporter or importer. A permanent tariff regime changes investment behaviour. Companies shorten supply chains. Production is relocated. Inventory buffers increase. Compliance costs rise. Lower-cost suppliers are replaced by politically acceptable suppliers. The result is less efficiency and higher prices.

The political logic is understandable. Governments want strategic control over semiconductors, medicines, energy infrastructure, defence production and critical minerals. They are increasingly unwilling to depend on geopolitical competitors for essential goods. But strategic autonomy is expensive. The inflationary cost does not necessarily appear immediately in official data. It accumulates gradually through lower productivity, duplicated capacity and reduced competition. This is why tariffs matter even when the announced rate appears modest. They signal that the world is moving from an economic system designed to minimise cost towards one designed to minimise vulnerability. The two objectives are not compatible. The third side of the triangle is artificial intelligence. The dominant market narrative has presented AI as a powerful source of future productivity. That may ultimately prove correct. If artificial intelligence improves decision-making, automates routine tasks and accelerates scientific innovation, it could eventually become disinflationary. But before AI produces productivity, it requires investment. Enormous investment. Data centres must be built. Electricity generation must expand. Transmission grids must be modernised. Advanced chips must be manufactured. Cooling systems must be installed. Land, steel, copper and specialist labour must be secured.

This creates inflationary pressure through several channels. The first is competition for physical resources. Data centres consume large quantities of electricity, construction materials and industrial equipment. They also require access to increasingly scarce components, particularly memory, storage and advanced semiconductors. The second is competition for labour. Engineers, electricians, construction workers and technical specialists command higher wages when demand exceeds supply. The third is competition for capital. Technology companies, utilities and infrastructure developers are issuing debt at the same time as governments are financing historically large deficits. This is one reason long-term yields remain under pressure. The US Treasury is no longer competing only with other sovereign borrowers. It is competing with the largest private investment cycle in a generation. Traditional buyers of long-duration government bonds now have a wider menu of alternatives. They can buy investment-grade corporate debt, infrastructure bonds, utility financing or securities linked to the AI build-out. The Treasury market remains the deepest and safest in the world, but safety does not eliminate competition. It changes the price investors demand. This explains why the pressure on long-term yields cannot be understood solely through central-bank policy. The Federal Reserve controls the overnight rate. It does not control the return investors require to finance the US government for thirty years. That return increasingly incorporates fiscal risk, inflation uncertainty and capital scarcity.

The same dynamic is appearing across developed markets. Governments are issuing more debt to finance defence, energy transition, ageing populations and industrial policy. Companies are borrowing more to finance technology investment. Central banks are no longer large structural buyers of government bonds. Foreign investors are becoming more selective. The cost of long-term capital is therefore rising almost everywhere. This is the real message behind the global bond sell-off. The era of abundant capital is ending. The consequences for central banks are particularly difficult. The Federal Reserve, the Bank of England and the Bank of Japan are all meeting against a background that has changed rapidly. Only a few months ago, the debate focused on when central banks could resume cutting rates. Now markets are again considering the possibility of further tightening. For years, investors benefited from central banks moving gradually towards easier policy. The risk now is the opposite. Multiple central banks may remain restrictive or even tighten simultaneously while global growth begins to slow. This would create a particularly hostile environment for financial assets. Higher rates reduce bond prices. Higher discount rates compress equity valuations. Higher energy costs weaken corporate margins. Tariffs reduce efficiency. AI spending increases capital intensity. The result is a more expensive economy and a more expensive financial system.

The combination of oil above USD 100, higher tariffs and AI-driven investment therefore creates a broader macroeconomic challenge than any of the three in isolation. Central banks cannot simply wait for headline inflation to decline. They must consider whether the economy’s underlying structure has become permanently more inflationary. That is the real question. Are these temporary shocks? Or are they the early signs of a new regime? The evidence increasingly favours the second interpretation. The Middle East conflict may eventually end, but energy security will remain a strategic concern. Tariffs may be renegotiated, but protectionism will remain embedded in policy. The AI investment boom may moderate, but the infrastructure requirements will continue for years. Fiscal deficits may narrow temporarily, but ageing populations, defence spending and industrial policy will keep borrowing needs elevated. This is why long-term bond yields matter more than the next central-bank decision. They are telling us that investors no longer expect a return to the world of zero rates, abundant liquidity and permanently subdued inflation. The market is beginning to demand compensation for uncertainty. Not only monetary uncertainty. Fiscal uncertainty. Geopolitical uncertainty. Technological uncertainty. Supply-chain uncertainty. The most important investment conclusion is therefore not that every bond should be avoided or every equity sold. It is that duration risk has changed. Long-term government bonds can no longer be treated as automatic protection against economic weakness. If inflation remains structurally elevated and fiscal issuance continues to rise, long yields may stay high even when growth slows. This breaks one of the central assumptions of traditional portfolio construction. Equities and bonds may once again fall together. The diversification offered by duration becomes less reliable. Cash and short-dated bonds become more attractive. Inflation-linked assets regain importance. Commodity exposure becomes strategically relevant. Country selection matters more. Balance-sheet quality matters more. Pricing power matters more.  The triple shock of energy, tariffs and artificial intelligence is therefore not simply another temporary disturbance. It is the clearest evidence yet that the price of everything is being reset. And above all, the price of money.