The most dangerous interest rate is the comfortable one. If policy feels broadly fine, investors relax, politicians crowd in, and the central bank becomes a utility. Ellen Zentner says rates do not need to be drastically lower. That may be right on the arithmetic. The problem is not the level. It is the load-bearing assumptions strapped to it.
A central bank that accumulates objectives becomes a weak player in a coordination game. The Fed’s statutory goals are price stability and maximum employment. Layer on climate, distributional goals, and market stability, and every rate decision is a political Rorschach test. Senator Pat Toomey flagged this years ago, arguing the Fed was wandering into social policy. Mission creep dilutes accountability and corrodes independence. In game theory terms, the Fed’s payoff function gets muddled; markets cannot infer the strategy. The risk is classic time inconsistency. Without a clear rule, the temptation to trade long-term price stability for short-term calm grows. Zentner’s point about not requiring drastic cuts is a relief only if the institution can credibly sit still when the room heats up.
Engineering teaches that constant loads can mask fatigue. Bridges fail not only from shocks but from unseen micro-cracks accumulating under steady weight. The past decade’s low and predictable rates bred duration risk in banks and complacency in allocators. Silicon Valley Bank was not undone by a massive rate level; it was undone by a long bet on a level staying constant. Today, a narrative of not needing drastic cuts comforts portfolios tethered to carry, leverage, and negative convexity. Suppressed rate volatility is like suppressed forest fires. You may get fewer burns in the short run, but the debris pile builds. When a spark lands, everything goes at once. The policy aim should be a system that tolerates small, regular adjustments, not one that demands heroic interventions.
Zentner expects labor market revisions. That is not a footnote. It is a core fragility. Policy set on preliminary data is a control problem with lagged and noisy signals. Turn the thermostat based on a faulty thermometer and you get oscillation. The Bureau of Labor Statistics revises heavily. Investors treat the first print as truth and then overcorrect when reality shows up months later. The right posture is Bayesian humility: keep priors flexible and weight fresh evidence by its reliability. A central bank under political pressure to move on every blip will overshoot. Rate policy is a PID controller without full state visibility; inject mission creep and the differential term starts amplifying noise. The result is wider cycles, not softer landings.
Global central bankers openly worry about being pulled into America’s political storm. That fear is not abstract. Term premia reflect uncertainty about the reaction function, not just inflation or growth. If independence erodes, fiscal dominance risk rises. The Barro-Gordon model predicted the inflation bias when policymakers cannot commit. Investors will price a wider range of outcomes: cuts to soothe equity drawdowns, hikes to reclaim credibility, and policy twists to meet non-mandate goals. This politics premium steepens risk in both directions. You can see it in cautious balance sheet management by foreign reserve holders and in the guarded tone of monetary officials abroad. They know that when the anchor boat swings, the entire harbor moves.
Make climate resilience a target for a central bank and you invite Goodhart’s Law: when a measure becomes a target, it ceases to be a good measure. The Fed has limited tools. When it uses rates or its balance sheet to influence non-monetary goals, it distorts signals elsewhere. Credit channels get politicized. Banks adjust to regulator preferences rather than risk-adjusted returns. The macro dashboard becomes a Christmas tree of blinking lights, none of them trustworthy. Markets then infer policy through political headlines, not data. That is fragility, not resilience. The Fed’s strength is narrowness. The further it strays, the weaker its core promise becomes.
The market’s most popular story is immaculate disinflation. History assigns low odds. The 1966 near-soft landing gave way to a decade of instability. The 1994 tightening avoided recession but bruised credit and Mexico. The 2018 pivot calmed markets and then came 2020. Soft landings are often pauses, not endpoints. They lull planners into leverage, extend-and-pretend in commercial real estate, and duration risk in private credit. Probability lives in tails, and tails grow fat when credit cycles stretch. A rate that feels fine today may sit atop fragile collateral values and optimistic underwriting. Zentner is right that rates need not be drastically lower. The question is whether the system built itself to depend on them being predictably lower soon.
If you want fewer crises, allow more discomfort. Macroprudential buffers should tighten in good times and relax in bad, not the reverse. Allow moderate rate variation rather than promising extended holds. Term out public debt when conditions allow, even if it costs more today, to reduce rollover risk. In markets, stop treating carry as income. Stress positions for liquidity gaps, not just price moves. Hold cash as an option, not a drag. Diversify across policy regimes, not just asset classes. Use rebalancing rules that force you to sell comfort and buy discomfort. Antifragility is earned through design. It cannot be tacked on with a speech after a drawdown.
We will do less, more predictably. We will not chase every data revision. We will accept small fires to prevent a conflagration. That is the message that would shrink the politics premium, improve signal extraction, and make stable rates safer. The 1951 Accord restored independence by drawing a boundary. Volcker rebuilt credibility by honoring it. The modern version is a leaner mandate, a clearer rule, and less forward guidance that invites over-interpretation. Rates may not need to be drastically lower. What needs to change is the expectation that rates, by themselves, can deliver stability when everyone else is leaning on them. The comfort we seek from policy is the comfort that erodes the bridge.
