The Revenge of the Supply Side

Author: Wind Chase Trading Platform

The global economy is undergoing a profound paradigm shift. The issue of insufficient demand that dominated macroeconomic policy over the past decade is giving way to a new economic era driven by supply constraints—this transition not only reshapes the logic of inflation but also significantly diminishes the effectiveness of traditional monetary and fiscal policy tools.

Deutsche Bank's latest report, released on September 14, indicates that the blockade of the Strait of Hormuz in 2026 is evidence of this paradigm shift. The strait previously accounted for about 25% of global maritime oil trade, and after the blockade, Brent crude oil prices returned to above $100 per barrel, while European natural gas futures reached their highest levels since the end of 2022. So far this year, the biggest shocks to the global economy have come from the supply side, rather than the demand side.

The warning for investors is clear: in a world constrained by supply, inflation will rise more frequently in pulses, the effectiveness of monetary easing will continue to wane, and fiscal stimulus is more likely to exacerbate overheating and crowd out private investment. The old policy script is becoming ineffective, and expanding the boundaries of economic supply will become the core proposition for future policy-making.

The End of the Era of Demand Shortage

Deutsche Bank states that to understand the current shift, one must look back at the historical legacy left by the 2008 global financial crisis.

The financial crisis marked the most severe economic contraction since the Great Depression. Since then, the concept of "secular stagnation" has resurfaced—under this framework, the equilibrium interest rate required for full employment is negative, and the zero lower bound has become an insurmountable barrier for monetary policy. The U.S. unemployment rate did not return to pre-crisis lows until 2017, while the Eurozone had to wait until February 2020, just as the pandemic was about to hit.

Throughout the 2010s, the Federal Reserve and the European Central Bank consistently failed to achieve the 2% inflation target, with policy rates stuck near the zero lower bound and long-term rates continuing to decline. In the summer of 2019, the yield on Germany's 10-year government bonds fell to -0.7%, making borrowing almost a "free lunch." At that time, the market was convinced of the persistence of low inflation and low interest rates—by August 2020, the yield on 10-year U.S. Treasuries hit a historic low of 0.51%.

This backdrop profoundly shaped the policy response during the pandemic. In 2020, the U.S. federal budget deficit reached 14.5% of GDP, the highest since 1945. Policymakers, concerned about deflation, pushed stimulus measures to unprecedented levels.

The Pandemic: A Turning Point in the Era of Supply Constraints

However, it was this massive stimulus that ignited demand shocks at the most vulnerable moment of the global supply chain.

During the pandemic lockdown, consumer spending shifted dramatically from services to durable goods, leading to supply chains being overwhelmed; a severe shortage of containers caused shipping costs to soar more than fivefold; the labor market underwent deep restructuring due to early retirements and career changes, forcing companies to compete for higher wages; meanwhile, energy producers cut back on drilling and exploration investments during the pandemic, resulting in supply struggling to keep up with demand when it rebounded, with Brent crude oil surpassing pre-pandemic levels by mid to late 2021.

At that time, many believed inflation was merely a temporary phenomenon brought about by the pandemic and economic reopening, and that the long-term deflationary forces of the past 30 years would ultimately reassert dominance. But by the end of 2021, the situation was undeniable: the U.S. CPI rose to 7.0%, the highest since 1982; the Eurozone CPI rose to 5.0%, the highest since 1991.

In early 2022, the Russia-Ukraine conflict dramatically accelerated this process. Energy prices surged, forcing European industries to decouple from Russian gas, while the blockade of Ukrainian Black Sea ports further drove up prices for wheat, corn, and other grains. The U.S. CPI peaked at 9.1% in June 2022, while the Eurozone CPI peaked at 10.6% in October. The Federal Reserve then initiated a rate hike cycle of 525 basis points, followed closely by the European Central Bank with a 450 basis point increase.

The Three Forms of Supply Shock

Deutsche Bank's report categorizes supply shocks into three types, corresponding to different policy response logics.

The first type is short-term shocks, such as low water levels causing key waterways to be obstructed. These shocks have a self-correcting nature, with output often rebounding in a V-shape, and inflation effects reverting to the mean, allowing central banks to "look through" them without taking action.

The second type is medium-term shocks, typically driven by geopolitical events or policy decisions, lasting several years and not quickly resolved. The blockade of the Strait of Hormuz is a typical case, as was the 1973 oil embargo—oil prices nearly quadrupled and remained high for several years thereafter.

These shocks often force permanent restructuring of trade flows and supply chains, transmitting inflationary pressures to core inflation components, which central banks cannot ignore and usually must respond by raising interest rates. Tariff policies also fall into this category.

The third type is structural trends, such as aging populations and the long-term evolution of globalization and de-globalization. These factors can permanently alter the potential growth rate of the economy, affecting the so-called r*, the equilibrium interest rate required for full employment. Many countries today are experiencing a shrinking working-age population, which means that potential GDP growth will need to rely more on productivity improvements rather than labor expansion.

Reflections from the 1970s

The current situation has profound historical echoes with the 1970s.

In that decade, two oil shocks followed in quick succession—the 1973 OAPEC (Organization of Arab Petroleum Exporting Countries) oil embargo caused oil prices to nearly quadruple, and the 1979 Iranian Revolution and subsequent Iran-Iraq War drove oil prices up again. The combination of supply shocks created a stagflation pattern of accelerating inflation and economic slowdown.

The report points out that the core lesson from the 1970s is that even if a single supply shock can theoretically be "looked through," a series of continuous shocks in reality can produce cumulative effects—much like chronic erosion, ultimately sufficient to unanchor inflation expectations and trigger a wage-price spiral. In fact, the Federal Reserve's overly accommodative policy after the first oil shock led to uncontrollable inflation, ultimately forcing Volcker to implement extremely hawkish monetary tightening after the second shock to clean up the mess.

Of course, the 1970s are not a perfect historical mirror. Today's economy has a much lower energy intensity than back then, and the economic transmission effect of oil price shocks has weakened. However, the risk mechanism of repeated supply shocks unanchoring inflation expectations remains relevant—especially as inflation in most major economies still exceeds targets.

The Triple Ineffectiveness of Old Toolboxes

Deutsche Bank's report clearly states that the era of supply constraints poses systemic challenges to the policy toolbox of the 2010s.

First, inflation will occur more frequently. In the 2010s, there was a significant amount of idle capacity (i.e., negative output gaps) in the economy, and additional demand stimulus could be directly converted into output growth rather than inflation.

But currently, an aging population is constraining labor supply, industrial reshoring policies are raising costs, and rising defense spending is increasing competition for capital, meaning the economy no longer has the buffer to absorb demand shocks. Notably, U.S. PCE inflation has remained above the 2% target since March 2021.

Second, the effectiveness of monetary policy is limited.

The transmission mechanism of interest rate cuts is essentially to stimulate demand, which is powerless against supply-side damage. When supply shocks simultaneously push up inflation and depress growth, central banks find themselves in a dilemma: raising interest rates can combat inflation but may further harm an already weak economy; while standing pat may allow inflation expectations to spiral out of control. After the blockade of the Strait of Hormuz, many central banks chose to wait several months rather than raise rates immediately, but the cost was that inflation continued to exceed targets in several countries.

At the same time, fiscal stimulus is more likely to trigger overheating and crowding-out effects.

After the financial crisis, high unemployment and negative output gaps meant that government spending multipliers were high, and borrowing costs were nearly zero. But the current environment is entirely different: government bond yields have returned to pre-crisis levels, and the "reverse crowding-out" effect from AI's massive computing power investments is pushing up interest rate pressures. In this context, fiscal stimulus not only comes at a higher cost but is also more likely to translate directly into inflation in economies lacking idle capacity.

Supply-Side Expansion: The Next Policy Axis

In the face of these challenges, the report indicates that the policy focus must inevitably shift towards supply-side expansion.

This logic has already begun to manifest in policy practice. The U.S. Inflation Reduction Act encourages clean energy investments, and the CHIPS Act aims to rebuild domestic semiconductor manufacturing capabilities. Although the intentions behind these policies vary, their essence is to attempt to expand the production boundaries of the economy.

The report suggests that effective policy directions in the future include: expanding energy production to reduce reliance on single supply channels, increasing housing supply, and bringing more labor into the market. The common logic of these measures is to enhance the potential growth rate of the economy without generating inflationary pressures.

History shows that significant supply shocks often serve as catalysts for structural adaptation. The oil crisis of the 1970s prompted the U.S. to establish the Strategic Petroleum Reserve in 1975, promoting energy diversification and ultimately achieving a historic shift to being a net energy exporter in 2019. The blockade of the Strait of Hormuz has already prompted multiple countries to seek alternative transportation routes and utilize strategic reserves—even if the long-term geopolitical trajectory remains unclear, the process of supply chain diversification has already begun.

Deutsche Bank emphasizes that in a world where supply has once again become the primary constraint, those who can expand supply boundaries first will hold the initiative for the next round of growth. For policymakers and investors, this means a fundamental update of their thinking framework is necessary.

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