Fed's Susan Collins Warns Global Fragmentation Could Raise Inflation

Boston Federal Reserve President Susan Collins warns that an increasingly fragmented global economy risks elevating inflation and making monetary policy more difficult to calibrate. Speaking at a Boston Fed conference on December 2, 2025, Collins said reduced integration in trade and finance, along with diverging industrial strategies among major economies, can push up domestic borrowing costs and increase volatility in price dynamics, even though she did not signal any immediate change to Fed policy.

Collins framed fragmentation as a structural shift rather than a transitory disturbance. She highlighted how trade frictions, selective supply chain reshoring, and more assertive industrial subsidies abroad can raise input costs for firms, reduce pricing competition, and create localized shortages that feed into consumer prices. Those channels can alter the transmission of monetary policy by changing the sensitivity of inflation to domestic demand and to interest rates.

Her comments arrive against a backdrop of markets that have recently been pricing the prospect of a Fed rate cut in December. Investors are watching for signals that could sway expectations about the path of the federal funds rate, and Collins underscored that structural shifts in the global economy are among the factors the Federal Open Market Committee is monitoring. She stressed that fragmentation can make inflation outcomes less predictable, complicating the timing and magnitude of policy moves necessary to sustain price stability while supporting employment.

The economic mechanics Collins describes carry clear market implications. Greater fragmentation tends to raise risk premia for cross border lending and investment, which can translate into higher real borrowing costs for households and businesses even if central bank policy rates remain unchanged. For corporations, the costs of diversifying supply chains or building domestic capacity can be passed through to consumers, raising headline and core inflation measures. For investors, heightened inflation volatility increases uncertainty about the real returns on bonds and other fixed income assets, prompting adjustments in portfolio allocation and risk pricing.

Policy responses will require coordination across multiple arenas. Monetary authorities face a tougher balancing act if global fragmentation makes inflation more susceptible to external shocks. Fiscal and trade policies will be central to shaping the longer term effects, since industrial policy choices and trade arrangements determine the degree of integration in production networks. Higher public investment in logistics, workforce training, and technology could mitigate some upward pressure on costs, but such measures take time to affect price dynamics.

Collins’ intervention serves as a reminder that post pandemic shifts in global trade and geopolitics are not merely geopolitical concerns. They are economic forces that can feed through into inflation and interest rates, altering the environment in which central banks operate. As policymakers and markets digest these risks, the debate over the appropriate mix of monetary, fiscal, and trade policy is likely to intensify.