Darrell Duffie On How to Fix the World’s Most Important Market

Episode Summary

Executive Summary: The episode examines why U.S. Treasury markets have become more volatile and less liquid, arguing that the core driver is yield volatility amplified by dealer balance-sheet constraints and an outdated market structure. Guest Daryl Duffie says the Fed backstop is necessary but insufficient; resilience requires reforms like central clearing, better capital rules, and potentially more all-to-all trading to reduce fragility in the world’s key safe-haven market.

Main Topics: Treasury volatility and market illiquidity (Priority: 5/5): The hosts open with the recent surge in Treasury yields and note that sharp moves are increasingly common, raising concerns about liquidity in the world’s most important bond market. Volatility as the main determinant of illiquidity (Priority: 5/5): Duffie summarizes research showing that higher yield volatility—driven by fiscal uncertainty, monetary policy uncertainty, COVID-like shocks, and geopolitical risk—explains most Treasury market illiquidity. Dealer balance-sheet constraints and feedback loops (Priority: 5/5): The conversation explores how dealer balance-sheet limits worsen stress: when volatility rises, dealers are less able to intermediate, which further increases illiquidity and volatility. Limits of Fed backstops (Priority: 4/5): While the Fed can stabilize markets during crises through repo lending, QE, and regulatory relief, Duffie argues that relying on emergency support is slow, incomplete, and creates moral hazard. Treasury market structure and central clearing (Priority: 5/5): Duffie lays out the current dealer-centered structure and argues that broad central clearing would reduce settlement risk, free balance sheet capacity, and potentially lower barriers to all-to-all trading. Capital regulation and the supplementary leverage ratio (Priority: 4/5): He criticizes the SLR for penalizing safe assets and argues for replacing it with stronger risk-based capital rules, combined with stress tests that include interest-rate spikes. Implications for the fiscal era (Priority: 4/5): The discussion links Treasury market fragility to a world of rising U.S. debt issuance and shrinking dealer capacity, suggesting the infrastructure of Treasury trading may be unsustainable without reform.

Key Arguments: Yield volatility is the main driver of Treasury illiquidity; Duffie says about 80% of illiquidity is explained by volatility alone. Fundamental shocks and market structure interact: when volatility rises, constrained dealer balance sheets make liquidity worse in a feedback loop. The Treasury market needs to be designed for extreme days because that is exactly when safe-haven investors most need it to function. The Fed’s crisis tools are valuable but cannot fully solve structural fragility; they are a backstop, not a substitute for market reform. The supplementary leverage ratio discourages intermediation even in very safe assets and should be replaced by more risk-sensitive capital rules. Broad central clearing would net down gross exposures, reduce settlement risk, and make Treasury intermediation more efficient. All-to-all trading should emerge organically, supported by infrastructure changes like central clearing rather than imposed bluntly by regulation. Dealer complaints about losing primary-market support are not persuasive enough to block structural reform, given the growth in government debt and limited dealer balance-sheet capacity.

Data Points: Episode length of Stock Movers promo: five minutes or less - Introductory ad for Bloomberg’s Stock Movers audio reports Dealer/liquidity explanation share: about 80% - Duffie says variation in yield volatility explains roughly 80% of Treasury illiquidity Fed emergency purchases in March 2020: nearly a trillion dollars - Duffie describes Treasury purchases in the first three weeks of the COVID market stress Time for liquidity restoration after March 2020 stress: five, six, seven, eight weeks - Duffie says market liquidity took several weeks to normalize after the crisis interventions Settlement risk reduction from central clearing: about 70% reduction - New York Fed study cited for peak March 2020 Treasury settlement exposure Peak one-day settlement exposure: in excess of a trillion dollars - Dealer-facing settlement risk during March 2020 stress without central clearing Settlement exposure with central clearing: as low as 300 billion - Estimated exposure if Treasury trades had been centrally cleared during peak stress Foreign exchange reserves held in Treasuries: something like 59% - Duffie notes Treasuries remain the dominant reserve asset despite some diversification Government securities market relative to GDP: about 150% or more - Duffie cites CBO projections showing growing Treasury supply relative to the economy Dealer participation in auctions: on the order of 10% plus or minus - Duffie says primary dealers currently take down roughly this share of Treasury auctions Weekly dealer balance-sheet data frequency: weekly - FR2004 data available to the Fed are collected on a weekly basis Expansion of balance-sheet issue: trillion dollars of treasuries - Duffie discusses how Fed purchases reduce dealer holdings but do not fully solve leverage-ratio constraints

Pivotal Quotes: "volatility seems to be the main determinant of illiquidity in the market" — Daryl Duffie: Core finding from the research discussed on Treasury market liquidity "I think you do want to build a market for the worst day in a thousand" — Daryl Duffie: Duffie argues Treasury market design should prioritize crisis-day functionality because that is when safe-haven demand is highest "we need to talk about this and maybe try to come up with a solution" — Tracy Alloway: Early in the discussion, framing the recurring Treasury liquidity problem as a structural issue requiring reform

Implications: Treasury market fragility is becoming a systemic infrastructure problem, not just a short-term trading issue. Expect more pressure for central clearing, SLR reform, and better stress testing as debt issuance rises and rate volatility remains elevated.