It's the volatility and unpredictability within the supply chain environment—rather than the magnitude of a single shock—that can dramatically amplify the inflationary effects of other events, like energy price spikes. This suggests central banks need situation-specific responses.
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The rapid construction of AI data centers is creating a huge surge in electricity demand. This strains existing power grids, leading to higher energy prices for consumers and businesses, which represents a significant and underappreciated inflationary pressure.
Former Fed Vice Chair Alan Blinder suggests businesses were hesitant to pass tariff-related costs to consumers because of constant policy changes. This uncertainty over the final tariff rate, while bad for investment, paradoxically suppressed the immediate inflationary impact many economists expected.
Contrary to narratives about excess demand, the recent inflationary period was primarily driven by supply-side shocks from COVID-related disruptions. Evidence, such as the New York Fed's supply disruption index accurately predicting inflation's trajectory, supports this view over a purely demand-driven explanation.
Policymakers can maintain market stability as long as inflation volatility remains low, even if the absolute level is above target. A spike in CPI volatility is the true signal that breaks the system, forces a policy response, and makes long-term macro views suddenly relevant.
Robert Kaplan cautions against dismissing inflation risks. Many businesses are still absorbing tariff costs or working through pre-tariff inventory. He believes the full price impact will be passed on to consumers in 2026, potentially keeping inflation stickier than markets currently expect.
The economic impact of tariffs is not an immediate, one-time price adjustment. Instead, Boston Fed President Collins characterizes it as a "long one-off" process where the full effect can take months or even a year to filter through the economy. This prolonged adjustment period extends uncertainty and complicates inflation forecasting.
The Federal Reserve can tolerate inflation running above its 2% target as long as long-term inflation expectations remain anchored. This is the critical variable that gives them policy flexibility. The market's belief in the Fed's long-term credibility is what matters most.
While a single tariff hike is a one-time price shock, a policy of constantly changing tariffs can become a persistent inflationary force. The unpredictability de-anchors inflation expectations, as businesses and consumers begin to anticipate a continuous series of price jumps, leading them to adjust wages and prices upwards in a self-reinforcing cycle.
Tariffs on foreign steel don't simply allow buyers to switch to domestic suppliers. A manufacturer of oil industry parts explained that most domestic mills aren't geared for their specific needs or quality requirements (e.g., heat treating). This reveals how tariffs create complex availability and quality challenges, not just simple price increases.
The longevity of above-target inflation is a primary concern for the Fed because it can fundamentally alter consumer and business behavior. Historical models based on low-inflation periods become less reliable. Businesses report being surprised that consumers are still accepting price increases, suggesting pricing power and inflation expectations may be stickier than anticipated.