When central bank chairs want to rewrite monetary history, they usually appoint a panel of experts to bless the strategy. Kevin Warsh, nominated to lead the Federal Reserve, inherited an $6.5 trillion elephant in the room: a massive central bank balance sheet that blew up during crisis after crisis and never quite made its way back down. To figure out what to do with all those Treasuries and mortgage-backed securities, he assembled a heavyweight task force featuring former Reserve Bank of India governor Raghuram Rajan, Harvard economist Jeremy Stein, and former Fed governor Karen Dynan.
If Warsh was looking for a green light to start aggressively dumping bonds, he picked the wrong team. For another perspective, consider: this related article.
The prevailing wisdom among market hawks has always been simple: Quantitative Easing (QE) was a temporary emergency response, so running off the balance sheet should just be a matter of turning off the tap. But monetary mechanics don't care about ideological purity. The moment a central bank expands its balance sheet, it fundamentally alters how private institutions behave. Trying to shrink that footprint without sparking a liquidity crunch is like trying to drain a swimming pool while everyone is still inside swimming.
Here's why the Fed's bloated balance sheet is so sticky, what Warsh's star-studded task force actually signals, and why financial markets should brace for a much slower unwind than the headlines suggest. Similar reporting on the subject has been shared by Business Insider.
The Ratchet Effect of Quantitative Easing
To understand why shrinking the balance sheet is so brutal, you have to look at what happens inside commercial banks when the Fed buys bonds.
When the Fed engages in QE, it purchases Treasury bonds or agency mortgage-backed securities from financial institutions. In return, it credits those institutions with brand-new bank reserves—digital dollars held at the Fed.
Most people assume that when QE ends and Quantitative Tightening (QT) begins, the process simply runs in reverse. The Fed lets bonds mature without replacing them, reserves shrink, and the financial system goes back to normal.
It doesn't work that way.
Research from Raghuram Rajan and NYU’s Viral Acharya highlights a structural trap built into QE:
- Liquidity creation is asymmetrical. When central banks inject reserves into the banking system, commercial banks don't just sit on them. They use the surge in perceived liquidity to expand their own commitments—issuing line-of-credit facilities, taking in uninsured deposits, and lengthening loan maturities.
- Reserves vanish, but obligations stay. When the Fed runs off its balance sheet, those bank reserves vanish from the system. However, the private credit commitments and demand deposits created during the boom don't disappear.
- The structural liquidity squeeze. Suddenly, banks find themselves short on liquid cash to back their expanded commitments. Money markets start creaking, short-term borrowing costs spike, and financial plumbing threatens to break—forcing the Fed to step back in and buy assets once again.
Every round of QE leaves behind an addiction to central bank liquidity. You can attempt to drain the water, but the pipe architecture has already expanded to require a higher volume.
The Clash Inside Warsh's Economic Advisory Squad
The three economists heading up Warsh’s balance sheet task force hold distinct, conflicting views on how central bank assets affect financial stability. Analyzing their track records reveals the exact conflict taking place behind closed doors at the Fed.
Raghuram Rajan: The Structural Skeptic
Rajan has long warned about the unintended consequences of easy money. His work clearly maps out the costs of keeping central bank footprints large. Yet, his analysis presents a paradox for hawks: precisely because QE creates structural dependencies, rushing to drain liquidity too fast causes violent disruptions in overnight funding markets. His message to Warsh is essentially a warning—disposing of these assets too rapidly creates severe tail risk.
Jeremy Stein: The Market Stability Advocate
Stein takes a completely different angle. Rather than viewing a large balance sheet solely as a policy mistake, he argues that a prominent Fed presence actively stabilizes markets. In Stein's view, when the central bank provides abundant, safe, short-term assets (reserves), it crowds out dangerous, fragile liquidity creation by shadow banks.
Stein has repeatedly pointed out that nominal balance sheet size matters less than asset duration. If the Fed wants to reduce its market footprint without triggering a credit crunch, it shouldn't focus on dumping total nominal assets as fast as possible; it should shift its holdings into short-dated Treasury bills.
Karen Dynan: The Policy Pragmatist
Dynan brings deep experience from both the Federal Reserve Board and the Treasury Department. While she hasn't spent her career focused exclusively on balance sheet mechanics, her background in fiscal-monetary interactions makes her an essential counterweight. Her presence guarantees that any balance sheet recommendation takes real-world Treasury issuance schedules and federal borrowing demands into account.
Why a Fast Unwind Won't Happen
Warsh has been a vocal critic of the Fed's expanded footprint for over a decade, arguing that massive asset holdings distort market signals, encourage fiscal profligacy, and muddy the boundary between monetary and fiscal policy.
Taking over as Fed Chair is a reality check. Wanting a smaller balance sheet and actually getting one are two wildly different things.
The Ample Reserves Reality
The Federal Reserve operates under an "ample reserves" framework. To keep short-term interest rates under control without micromanaging daily operations, the Fed must ensure banks hold abundant cash. If bank reserves drop below a critical threshold—what the Fed calls the Lowest Comfortable Level of Reserves (LCLoR)—short-term funding markets quickly turn chaotic. We saw this exact breakdown in September 2019, when overnight repo rates surged to 10% almost overnight, forcing the Fed to jump back into the market as a lender.
The Treasury Market Demand Vacuum
The U.S. government is running massive fiscal deficits that require constant, heavy Treasury issuance. When the Fed actively shrinks its balance sheet, it stops buying Treasuries and allows existing holdings to mature. That means the private sector—pension funds, foreign governments, commercial banks, and hedge funds—has to step up and absorb trillions in federal debt.
If private demand falls short, long-term Treasury yields jump, driving up borrowing costs for mortgages, corporate loans, and consumer credit across the board.
Mortgage-Backed Securities Inertia
The Fed still holds around $2 trillion in mortgage-backed securities (MBS) on its books. Because interest rates rose dramatically from their pandemic lows, existing homeowners aren't refinancing or selling their homes. As a result, prepayments on these underlying mortgages have plummeted to a trickle.
Passive runoff—simply letting MBS mature—takes decades. The only way to get rid of them faster is through active asset sales, which would slam the mortgage market and push home borrowing costs significantly higher. That's an economic and political non-starter.
What Real Unwinding Looks Like from Here
Instead of an aggressive liquidation sale, expect a strategic shift in how the balance sheet is managed. Warsh may want a leaner Fed, but institutional mechanics will dictate the pace.
- Shortening Asset Duration: Expect the Fed to shift its portfolio mix heavy on short-dated Treasury bills rather than long-term bonds. This reduces the Fed’s distortion of long-term borrowing rates while keeping system liquidity intact.
- Coordinating with the Treasury: Look for closer alignment between the Fed and the U.S. Treasury on debt issuance profiles, effectively managing yield curve pressures together.
- Accepting a Higher Floor: The balance sheet will likely remain vastly larger than pre-2020 levels. Structural shifts in banking regulations and reserve demand mean returning to a pre-2008 central bank profile is virtually impossible.
Investors waiting for a rapid collapse in central bank liquidity will likely be disappointed. Warsh’s consultants know what the market already suspects: once you turn the Fed into the world's primary liquidity provider, getting out of that business is a long, slow process.
What to Watch Next
- Monitor Reserve Levels closely: Track total bank reserves on the Fed's H.4.1 balance sheet report. Any dip toward $3 trillion will signal funding market stress before it shows up in mainstream news.
- Track Repo Market spreads: Watch the Secured Overnight Financing Rate (SOFR) relative to the Fed’s Interest on Reserve Balances (IORB). Spikes in SOFR indicate that balance sheet drainage is hitting operational limits.
- Watch Treasury issuance maturity splits: Pay attention to whether the U.S. Treasury shifts issuance toward short-term bills versus long-term bonds to accommodate central bank balance sheet runoff.
