Henry Curr on the Myths and Uncomfortable Truths about QE

Episode Summary

Executive Summary: Henry Kerr discusses his paper on quantitative easing (QE), arguing that popular views overstate QE’s ability to prop up markets or fund government in normal times. He says QE mainly works through signaling, not portfolio balance, is hard to calibrate, and has hidden fiscal and banking-system consequences. The episode ends by considering whether future low-rate environments will force more QE or a bigger role for fiscal policy.

Main Topics: Defining QE and why the paper was written (Priority: 5/5): Kerr defines QE as central bank purchases of government debt with newly created reserves and explains he wrote the paper to reconcile public narratives with macroeconomic theory. Myth 1: QE props up financial markets (Priority: 5/5): Kerr argues that outside crisis periods, QE is not a uniquely market-distorting tool; its effects largely reflect signaling about future short rates rather than a special financial-market channel. Portfolio balance vs. signaling channels (Priority: 5/5): The discussion contrasts the intuitive asset-supply story with the more credible signaling explanation, emphasizing the theoretical tension in portfolio balance models. Uncertainty in QE’s effectiveness (Priority: 4/5): Kerr stresses that policymakers do not know precisely how much QE moves rates, because evidence relies mostly on event studies and the effects are state-dependent. Myth 2: QE funds the government (Priority: 5/5): He rejects the idea that QE uniquely finances government spending, arguing it mainly changes debt maturity composition and can raise fiscal costs later through interest on reserves. Myth 3: QE only affects the monetary base / bank balance sheets (Priority: 4/5): Kerr says QE also affects broad money by creating bank deposits when non-banks sell bonds, and it can swell bank balance sheets enough to interact with leverage regulation and money markets. Future policy mix: QE, fiscal policy, and low-rate regimes (Priority: 4/5): The conversation closes by exploring whether low nominal/real rates will keep QE central, whether central banks need new tools, and whether fiscal policy must take a larger role in stabilization.

Key Arguments: QE is best understood as government debt purchases with newly created central bank reserves, but its real-world meaning has become broader and often imprecise. In crisis moments (e.g., March 2020), QE clearly stabilizes financial markets by restoring market functioning; that is not the same as its normal-time effects. The strongest evidence for QE’s main normal-time channel is signaling: asset purchases matter because they reveal the expected path of future short-term rates. Portfolio balance theory requires contradictory assumptions: segmented markets to move yields, but tight spillovers for those yield changes to matter more broadly. The private sector ultimately bears central bank liabilities in an aggregate sense, so QE can resemble a debt-maturity swap rather than net creation of wealth or risk-free stimulus. There is no reliable Taylor-rule-like framework for deciding QE size, so central bankers are effectively experimenting with uncertain effects. QE does lower government financing costs, but mainly by shortening duration; this is not a unique funding miracle and can shift costs into interest-on-reserves payments later. QE affects broad money and deposits when the central bank buys assets from non-banks, but its effect on total money can be offset by weak credit creation or bank deleveraging. Large QE programs can strain bank regulation and market plumbing, especially when reserve and balance-sheet growth interact with leverage constraints. If QE is largely signaling, policymakers might need clearer coordination between fiscal and monetary policy or alternative tools for forward guidance and stabilization.

Data Points: QE stock-to-yield rule of thumb: 10% of GDP in asset purchases ≈ 0.5 percentage point reduction in 10-year government bond yields - Kerr cites literature summarized by Joseph Gagnon when discussing the uncertain magnitude of QE effects. Pandemic-era implied yield effect: More than 200 basis points - Kerr says applying pre-pandemic rules of thumb to the Fed’s pandemic QE implies a very large effect on 10-year yields. Key crisis periods: 2008-2009 and March 2020 - Episodes where QE clearly functioned as a market-stabilizing intervention during financial panic. Fed balance sheet runoff: Announced for 2022 (near future at time of interview) - Used to motivate the timeliness of the discussion about whether balance sheet reduction matters. Reserve remuneration: Interest on reserves rises with policy rates - Kerr notes that QE can impose fiscal costs by requiring higher interest payments on reserves when rates rise. Supplementary leverage ratio (SLR): Binding constraint on bank balance sheets - Discussed as a regulatory channel through which QE-expanded deposits can create market frictions. Fed monthly QE pace (pandemic reference): $120 billion per month - Mentioned as an example of the scale of QE that raises questions about calibration. Central bank liquidity facilities: Overnight reverse repo facility used at scale - Referenced as a way the Fed absorbed excess liquidity created by QE and money-market conditions.

Pivotal Quotes: "QE is the purchase of government debt with newly created central bank reserves." — Henry Kerr: His working definition of QE at the start of the interview. "Nobody knows how much QE affects interest rates." — Henry Kerr: Uncomfortable Truth #1, emphasizing the uncertainty of calibration and empirical measurement. "QE funds the government." — Myth discussed by Henry Kerr: This claim is directly challenged as a simplistic interpretation of QE’s effect on public finance.

Implications: Listeners should treat QE as a blunt, imperfect tool whose main normal-time power may be signaling, not magic market support. The episode suggests more attention to fiscal-monetary coordination, regulatory side effects, and alternative stabilization tools in low-rate economies.