41 - Gauti Eggertsson on the Zero-Lower Bound and Liquidity Traps

Episode Summary

Executive Summary: David Beckworth interviews Gauti Eggertsson about his path into macroeconomics, his work with Bernanke and Woodford, and his research on liquidity traps, the zero lower bound, QE, and secular stagnation. Eggertsson argues that when rates hit the ZLB, expectations about future policy matter more than asset purchases alone, and that central banks should be willing to tolerate temporary inflation overshoots or level targeting to escape persistent shortfalls.

Main Topics: How Eggertsson entered macroeconomics (Priority: 2/5): He traces his interest to a high-school booklet on Adam Smith that made economics feel like a scientific way to study human interaction, eventually leading him into macroeconomics. Graduate training and intellectual influences (Priority: 4/5): Eggertsson discusses working with Bernanke, Woodford, Krugman, Svensson, and Simpson at Princeton, emphasizing how unusual and formative that concentration of liquidity-trap thinkers was. Liquidity traps and the zero lower bound (Priority: 5/5): The core macro topic is the constraint that nominal interest rates cannot easily fall below zero, limiting conventional monetary policy in deep recessions and forcing policymakers to rely on expectations and alternative tools. QE, irrelevance, and forward guidance (Priority: 5/5): He explains the Woodford-Eggertsson irrelevance result: asset purchases are ineffective unless they change expectations about future short rates, making forward guidance central to policy transmission. Inflation targeting, asymmetry, and policy credibility (Priority: 5/5): Eggertsson argues that central banks were often too reluctant to allow temporary inflation overshoots, creating an asymmetric de facto inflation target that kept recoveries weak. Secular stagnation and persistent low r-star (Priority: 4/5): He connects long-run demand weakness, demographics, inequality, and safe-asset scarcity to a persistently low natural rate of interest, which raises the risk of prolonged ZLB episodes. Trump-era fiscal policy and rising rates (Priority: 3/5): He notes that larger deficits, tax cuts, and infrastructure spending could lift r-star and long-term rates, though uncertainty remains about policy direction and the Fed’s tolerance for inflation.

Key Arguments: The liquidity trap is best understood today as the zero lower bound on nominal interest rates, not the old view that money becomes useless. At the ZLB, open market operations are weak unless they alter expectations about future policy; thus communication and commitment are central. QE can work partly through signaling and financial-frictions channels, but much of its effect depends on whether markets believe the central bank will keep policy easier for longer. Temporary inflation overshoots or level targeting can help make policy credible and raise expected inflation, lowering real rates enough to escape the trap. The Fed’s behavior after the crisis looked asymmetric: highly adventurous with its balance sheet, but reluctant to adjust inflation objectives or tolerate overshoots. Secular stagnation may reflect persistent shifts in the natural rate of interest from demographics, inequality, productivity, and safe-asset demand, making ZLB episodes more frequent. Larger government debt and infrastructure spending can raise the natural rate of interest, potentially easing secular stagnation and nudging long-term yields upward. Political economy and memories of the 1970s likely made central banks reluctant to experiment with inflation overshoots, even when undershooting was persistent.

Data Points: Historical price-level decline in Great Depression: about 30% - Eggertsson cites the U.S. price level falling from 1929 to 1933 as a key reflation case. Japan’s QE balance-sheet expansion: about 700% - He mentions the Swiss National Bank and Japan as examples of very large balance-sheet expansion with little inflation response. Inflation target in the memo example: 2% - Used in the New York Fed memo example of “inflation debt” accounting. Inflation miss example: 1% inflation for two years - If the target is 2% and inflation runs at 1% for two years, the accumulated inflation debt equals 2%. Fed core PCE inflation since crisis: about 1.5% average - Beckworth argues the Fed undershot its target on average after the crisis. Trump tax-cut debt estimate: $6–7 trillion over 10 years - Eggertsson cites estimates that the proposed tax cuts would significantly increase federal debt. Trump infrastructure plan: about $1 trillion over 10 years - He says infrastructure spending could raise the natural rate of interest. 10-year Treasury yield post-Trump: around 2.4% - Beckworth notes yields rose from around 1.7–1.8% before the election. 10-year Treasury yield before Trump: around 1.7–1.8% - Used as the pre-election comparison point for rising long-term rates. QE3/Fed thresholds: explicit thresholds for liftoff - Eggertsson says the Fed moved toward forward guidance by stating thresholds for when rates would rise.

Pivotal Quotes: "We suggest FOMC keeps track of the extent to which inflation has missed its target. Let us call these accumulated misses inflation debt." — Gauti Eggertsson (memo quoted by Beckworth): Describing a framework for symmetric inflation targeting and level-style policy accounting. "Open market operations should be largely ineffective to the extent they fail to change expectations regarding future policy." — Gauti Eggertsson / Michael Woodford: Core irrelevance result from their zero-lower-bound work. "It was a very common argument at the time. And I wouldn't be surprised if she had, you know." — Gauti Eggertsson: On pushback to allowing temporary inflation overshoots and the role of risk-premium concerns.

Implications: For policymakers, the transcript argues that escaping ZLB traps requires credible commitments, not just larger balance sheets. For listeners, it shows why level targeting, flexible inflation targets, and fiscal support matter when low rates persist.